Roland KR-33 Keybed disassembly

Trying to diagnose the contact strip issues on a Roland KR-33, but the keybed is not similar to the other boards I’ve had (Yamaha) and I’d like some input on removing the keys before I experiment. It looks like the metal rail on the back of the keybed comes off but I don’t see a path past this point.
Also, I’ve been unable to locate a service manual for this model.
thanks in advance…tony