Ok, so I spoke to my mechanic about the issue and he searched through a stack of business cards and pulled a couple of names that might be able to help. One of the guys used to deal with racing supras and knows about the issue and used to fix them all the time, and yes as you said pwpanas, soldered joints going bad in the dash
However he doesn't do that work anymore so will have to try him for info on where and what to do. I have another guy to call that has done supra dashboards and may also be able to help. It's not a priority, but needs to get fixed in the near future.