TB. If it doesn’t work, try T1 if it’s spare. If not, I’ll need to check the mapping in the pins.h file and send it to you. Feel free to pay with that firmware. It’s pretty hard to do any damage from a configuration.h modofication point of view. Repetier has a myriad of safety features built in, preventing temperature inconsistencies and shutting down the printer when one from any of the thermistors (hotends and heated bed) diverge from the set temperature.