I am certainly not a repair main, but from what you tell it seems like the BPPC has got only a bad contact and that sounds easy to repair. The Bvision is another thing. I have read on this forum in another topic of a similar problem that it can only be repaired by a really specialized person with plenty of soldering experience, no matter if it´s Amiga related or not ... how much are you prepared to spend at it

Some dealers like to ask high prices ... :-o