Patches and discussion for Ensoniq VFX family

I've got an interesting issue I could use ideas with.  On my VFX the #2, 3 and 4 button won't press and change.  So I opened it up and found the PC board below those buttons is stretched/warped(?) and the buttons when pushed don't make enough contact.  If I hold the board up just a tiny bit and keep it from flexing they all work fine.  I tried shoring that area up with some black electrical tape, but it didn't last long and stretched out again.  I'm not pushing the buttons hard, but it appears it's previous owner did.  Help?

Jim