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Make sure you also clean the AM/VM switch on the front panel. I'd also take Kurt's suggestion and closely monitor the output voltage and see if you are really getting a true over voltage condition or is it a false trigger caused by a bad connection, dirty contact etc.

Yup, Exactly....

I think the first thing you should do is give the AM/VM and AC select switches a good cleaning and exercise them a bit. Could be just oxidation on the contacts causing bad connections. There's lots of discussions here about the switches, what happens when they are dirty and how to clean them...

Is the Hz gage at 60 approximately? My first guess is a defective, damaged or otherwise "messed up" voltage adjustment Pot in the voltage regulator. If you look at the VR you will see a small hole in the front cover with an adjustable potentiometer behind it. I had a machine where someone tried...