[Stuckinda60s]

Originally Posted by Greg Reid

One more suggestion....I have found cures to many issues of the type that you describe by using what we used to call 'freeze spray'. It is essentially a small aerosol can of freon and it's commonly used by housecleaning services to remove chewing gum from carpets..
When you have an intermittent issue like this, especially one that seems to show up as the components warm up to operating temp, you can spray this stuff on individual components and solder joints. It's used with the straw so you can pinpoint individual spots. Many times, cooling the faulty component or connection will start the device working again. I have found many faulty capacitors, IC chips, transistors and etc. this way. Sometimes even a bad solder joint will straighten out when cooled suddenly. Capacitors, transistors, diodes and ICs are especially receptive to this method.
Even if freon is no longer used, I'm sure it's been replaced by something comparable. You have to be a little more cautious with this being that it is used with power on.
Just another thought on something you might try.

CO2 would be an alternative. The EPA hasn't found a way to outlaw that...yet.