For those that don’t know acorn, brooks and bison 80 curved lifts have been going through some R&D. They have recently been trialling a new pcb. A single pcb which has a dual digit diagnostic display. This pcb requires a special programmer which you can’t buy and the manufacture will give you no help/tech support on the lid either. Not even to dealers. Hope this info is helpful.
Sounds about right, in the elevator trade manufacturers have been moving away from this type of thing as consultants have wised up and been writing in the spec that the controllers have to be open or with diagnostics built in.