Did you contact Steve McCormack directly?
IMHO... for the extreme cost of repair you can buy a new unit for less that has modern advancements that will outperform it. For example, modern volume controls are far superior.
McCormack ALD-1 repair
I have a McCormack ALD-1 in need of repair. I reached out to Conrad-Johnson, who claim on their website to repair McCormack, and received the reply that they no longer do so. Right channel is limping and their is evident heat damage on a board. The resistor color codes cannot be read. My go-to local tech cannot repair it, especially with no schematics. I hate to relegate this sweet pre to use as a beautiful boat anchor. Does anyone know of a business who does repair work on said unit?