Technics GA3 organ sounds missing

I've recently moved (2 lumpy removal men) a Technics GA3 from the ground floor to the first floor and have lost the organ sounds during the move.

I've retraced the route the guys took, had a look on the floor, and can't find them anywhere.

Essentially I've lost all of the organs from the Hammonds through to Church. Everything else works as it should, piano sounds, drums and whatnot.

My thoughts are a circuit board or edge connector has been disturbed. I've purchased some contact cleaner and propose to lift the circuit boards out and clean the edge connectors. I'm not totally numb to what I'm going to find but would value any pointers especially board identification before I take the back off.

I have an old GA1 in store with a failed LED. The 'organ sounds card' worked well on that. In the event I find something terrible on the GA3 card does anyone know are any of the cards between the GA1 and GA3 interchangeable.

Any assistance would be gratefully received.