Patches and discussion for Ensoniq VFX family

I have an old VFX-SD and it has been repaired two times for the keyboard 
error, that occasionally appears. I remember lots of discussions about the 
issue and that there was some final solution to the problem. I googled for 
the solution but couldn't be sure of which page showed the procedure that 
showed the right repair instructions. Could anybody help me here? Point to 
the right pages?

The error is the calibrating error # something, which occures in my VFX when 
it gets hot. It might help to shut down it, gently press the keys so it 
makes this "chiropractic" noise and then turn it on.

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Johan Halm\ufffdn