Non-sounding keys on Roland kr-55

Hi all, this is my first post on Syntaur so I hope i’m in the right place.
I’ve offered to help a friend with a Roland KR-55, which has groups of key that are not triggering the selected sounds. Has someone else had a similar issue with this keyboard? It has been stashed in a cupboard for several years and may well have mould/damp in the workings somewhere.
I’m willing to buy any parts and fit them myself, if I can pinpoint the problem.

Here’s a blog post that will probably be helpful in determining the problem:

Keys not responding correctly? Check the contact strips. – Synth Wizards (

Both the contact strips and the contact boards for the KR-55 are no longer available, so hopefully you don’t need to replace any parts.