flavio81
Turntable technician
AN660, AN640G, DN860, and MN6042 are the only proprietary ones.
There are four boards of consequence in the controller. The motor chassis board have only a few diodes and resistors on them, otherwise used for connection points, tactile switches, strobe LEDs, etc. Nearly nothing to go wrong on those and one really never touches them.
Well, I guess you and I are standing on the "electronics with ICs can be made reliable" camp?