Meade RCX400 Runaway Focus Motor

I have a 12" Meade RCX 400 which I have had stored for a couple of years. Got it out last week and it has a problem where when I push a focus button, 2 of the motors work correctly and the third runs crazy for about a second and stops. Someone (meade?) had labeled the motors A, B, and C. B is the crazy one. When I swap the plugs with C, C becomes the crazy one, so problem with the Focus board I presume. I'm a very experienced electronics technician. The board is very logically laid out and I have made hundreds of comparison measurements between the working and non working channels and I can't find any discrepancies. Solder all looks perfect. I presume I need to replace the board but am not having any luck finding one. Blogs and forums have not produced any useful information. I did run the auto cal and restore the collimation defaults as suggested in one older post to no avail. Anyone have any ideas? Someone I can contact? Sources for the part? I have gathered that it is a pretty stock problem, but haven't seen any stock solutions except "send it to Meade". I gather Meade will not sell the part. Sure could use some help with this. Thanks!!