Fix the sensitive pin definitions, there where analogue numbers in the digital pin list. Also made M42 without a P function on the LED_PIN (which was otherwise a useless pin definition)

Marlin/Configuration.h

 // 70 = Megatronics
 // 90 = Alpha OMCA board
 // 91 = Final OMCA board
-// Rambo = 301
+// 301 = Rambo
 
 #ifndef MOTHERBOARD
 #define MOTHERBOARD 7

Marlin/Marlin_main.cpp

       if (code_seen('S'))
       {
         int pin_status = code_value();
+        int pin_number = LED_PIN;
         if (code_seen('P') && pin_status >= 0 && pin_status <= 255)
+          pin_number = code_value();
+        for(int8_t i = 0; i < (int8_t)sizeof(sensitive_pins); i++)
         {
-          int pin_number = code_value();
-          for(int8_t i = 0; i < (int8_t)sizeof(sensitive_pins); i++)
+          if (sensitive_pins[i] == pin_number)
           {
-            if (sensitive_pins[i] == pin_number)
-            {
-              pin_number = -1;
-              break;
-            }
-          }
-          
-          if (pin_number > -1)
-          {              
-            pinMode(pin_number, OUTPUT);
-            digitalWrite(pin_number, pin_status);
-            analogWrite(pin_number, pin_status);
+            pin_number = -1;
+            break;
           }
         }
+        if (pin_number > -1)
+        {
+          pinMode(pin_number, OUTPUT);
+          digitalWrite(pin_number, pin_status);
+          analogWrite(pin_number, pin_status);
+        }
       }
      break;
     case 104: // M104

Marlin/language.h

 // 7  Italian
 // 8  Portuguese
 
+#ifndef LANGUAGE_CHOICE
 #define LANGUAGE_CHOICE 1  // Pick your language from the list above
+#endif
 
 #define PROTOCOL_VERSION "1.0"
 

Marlin/pins.h

 #define Z_MAX_PIN          -1
 #endif
 
-#define SENSITIVE_PINS {0, 1, X_STEP_PIN, X_DIR_PIN, X_ENABLE_PIN, X_MIN_PIN, X_MAX_PIN, Y_STEP_PIN, Y_DIR_PIN, Y_ENABLE_PIN, Y_MIN_PIN, Y_MAX_PIN, Z_STEP_PIN, Z_DIR_PIN, Z_ENABLE_PIN, Z_MIN_PIN, Z_MAX_PIN, LED_PIN, PS_ON_PIN, \
+#define SENSITIVE_PINS {0, 1, X_STEP_PIN, X_DIR_PIN, X_ENABLE_PIN, X_MIN_PIN, X_MAX_PIN, Y_STEP_PIN, Y_DIR_PIN, Y_ENABLE_PIN, Y_MIN_PIN, Y_MAX_PIN, Z_STEP_PIN, Z_DIR_PIN, Z_ENABLE_PIN, Z_MIN_PIN, Z_MAX_PIN, PS_ON_PIN, \
                         HEATER_BED_PIN, FAN_PIN,                  \
                         _E0_PINS _E1_PINS _E2_PINS             \
-                        TEMP_0_PIN, TEMP_1_PIN, TEMP_2_PIN, TEMP_BED_PIN }
+                        analogInputToDigitalPin(TEMP_0_PIN), analogInputToDigitalPin(TEMP_1_PIN), analogInputToDigitalPin(TEMP_2_PIN), analogInputToDigitalPin(TEMP_BED_PIN) }
 #endif

Marlin/temperature.cpp

 static int bed_maxttemp_raw = HEATER_BED_RAW_HI_TEMP;
 #endif
 static void *heater_ttbl_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS( (void *)HEATER_0_TEMPTABLE, (void *)HEATER_1_TEMPTABLE, (void *)HEATER_2_TEMPTABLE );
-static int heater_ttbllen_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS( HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN, HEATER_2_TEMPTABLE_LEN );
+static uint8_t heater_ttbllen_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS( HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN, HEATER_2_TEMPTABLE_LEN );
 
 static float analog2temp(int raw, uint8_t e);
 static float analog2tempBed(int raw);
   if(heater_ttbl_map[e] != NULL)
   {
     float celsius = 0;
-    byte i;
+    uint8_t i;
     short (*tt)[][2] = (short (*)[][2])(heater_ttbl_map[e]);
 
     for (i=1; i<heater_ttbllen_map[e]; i++)
     float celsius = 0;
     byte i;
 
-    for (i=1; i<bedtemptable_len; i++)
+    for (i=1; i<BEDTEMPTABLE_LEN; i++)
     {
-      if (PGM_RD_W(bedtemptable[i][0]) > raw)
+      if (PGM_RD_W(BEDTEMPTABLE[i][0]) > raw)
       {
-        celsius  = PGM_RD_W(bedtemptable[i-1][1]) + 
-          (raw - PGM_RD_W(bedtemptable[i-1][0])) * 
-          (float)(PGM_RD_W(bedtemptable[i][1]) - PGM_RD_W(bedtemptable[i-1][1])) /
-          (float)(PGM_RD_W(bedtemptable[i][0]) - PGM_RD_W(bedtemptable[i-1][0]));
+        celsius  = PGM_RD_W(BEDTEMPTABLE[i-1][1]) + 
+          (raw - PGM_RD_W(BEDTEMPTABLE[i-1][0])) * 
+          (float)(PGM_RD_W(BEDTEMPTABLE[i][1]) - PGM_RD_W(BEDTEMPTABLE[i-1][1])) /
+          (float)(PGM_RD_W(BEDTEMPTABLE[i][0]) - PGM_RD_W(BEDTEMPTABLE[i-1][0]));
         break;
       }
     }
 
     // Overflow: Set to last value in the table
-    if (i == bedtemptable_len) celsius = PGM_RD_W(bedtemptable[i-1][1]);
+    if (i == BEDTEMPTABLE_LEN) celsius = PGM_RD_W(BEDTEMPTABLE[i-1][1]);
 
     return celsius;
   #elif defined BED_USES_AD595