HP85 sticky keyboard

[tom ponsford]

I just got around to checking out a pretty clean HP-85 I picked up at 
auction last month. So far it powers up and runs a simple basic program 
I typed in.

I haven't checked out the cassette,  although it doesn't look too bad 
either. The only real issue so far is a sticking keyboard.
Before I crack the case and check it out, are there any pointers on 
fixing the sticky keys, any caveats.

Cheers

Tom