I'd double check that. I don't think the /6 pin/circuit boards are available. There are stories of people repairing these. You are right they can be damaged by heat but some riders have soldered them I think. Horsehocky's repair kit might be better beings it doesn't involve heat.
There is also an inmate here at Adventure Rider that repairs them for you. It's his business. He has a good rep. His name is Wirespokes.