Re: Servis M6753W
If the last three on the main board are 103 or 203 then the programs are held on the facia board which reprograms the bottom main board when this is changed. If the facia board is faulty then you need a Servis PDA to reprogram it. If the board is not 546089203/103 then the board is preprogrammed. You then just change it, as mentioned earlier make sure you check the button keypad (facia) too as these have a habit of jamming and also causing the leds to flash