Korg SP-100 Key Swap - How to safely change a key?

[taiko]

Fellow Korgsters,

I have a fully functional SP-100 but have just received another with a few dodgy keys and jacks.

I have stripped the piano down to the keyboard section but i'm loathe to remove any screws from this final section without some guidance. No casing left just the keyboard section.

Has anyone taken an SP apart and could advise?

I see a service manual on ebay and other sites for £20 but i'm not sure if it covers dis-assembly.

I'm technically competent but can't see a way to remove just one key at a time without undoing whole rows of screws first.

Can provide photos if required but i reason they wouldn't help someone unfamiliar with the product.

Just need someone to tell me which screws to remove first, or some trick for removing a single key.

Hope someone can help!