Bomarc Services, of PO Box 1113, Caspar, WY 82602 produce(d) some, and may be able to help you with MLB and PAB schematics, at a price. There are no internals shown for the SIMMs, …
Analog board checks out, so my repair there was a success. Unfortunately the logic board is toast... me and Wackymacs on IRC, with his copy of Larry Pina's book handy, were unab…