[Burt]

Update:
I had forgotten that the uplock actuator does not have any hoses. Just hard lines. Checked fittings and all tight. Examined lines for cracks, did not find any that can be seen visually. Rechecked all fittings and lines for wetness and all are dry as well as the actuator itself.
So decided to do a test flight without reinstalling the rear floor panel and carpet. During gear retraction when the uplocks engaged there was no squeal or squeak. We left our headsets off to make sure we could hear it and there was nothing. Must have had something to do with the homemade hydraulic mule we were using. It is probably putting out more pressure and volume than my engine driven pump but why it would not have caused the uplock actuator to squeal during retraction on previous annual inspection gear swings is still a mystery.
Burt