Tuning Caps and I just verified on the schematic that they are all connected to ground and the other side goes to a n/o relay contact. Testing should not require removal and I venture a guess that it’s safe to use a megger in the RF circuit. Please correct me if I’m wrong about the megger. I’ve long since replaced this ATU but, I could use a second one. My options are to send it back to the mfg or try to fix it. Moving away from the ATU and back to test equipment. I think I’ve narrowed capacitor test equipment down the BK Precision 890C Capacitance meter or the 879B LCR. I’m about a step away from pulling the trigger on the 879B. Is there something else that I should look at before pulling the trigger?