I'm trying to track down an issue that popped up with my Model 33. I had the UCC-6 pulled out for a bit, but it had worked before. After re-installing the unit, I found that there was a buzz coming from the selector magnet with the switch powered off. It runs open in local mode. I see no obvious issues with the SMD card, and the flat green resistor tests well. I don't have much of a proper way to test the loop capacitor right now. 

Has anyone encountered an issue like this? Any suggestions for parts to test? 

Thank you all and 73,

Aidan W9POG