Not sure if repairing them is much of an option but I bought a second hand MULF BT Module from this place:

Autohaus Dublin
Auto Parts Store
Address: Avonbeg Industrial Estate, Long Mile Road, Dublin 12
Phone01) 405 0040
Hours: Open today · 9:00-6:00 p.m.

They will have all sorts of stuff, but be sure to have your own one to hand so you can be sure it's the right pt no. and shape!!