Elliot, what are you going to do with that R2LC dud? Are these routinely repaired, saved for scavenger parts, or just tossed? If the latter, would you send it to me?
I don't run TMCC and don't plan to but this signal-measurement discussion has been going on for years and I'm curious. I suppose I could get lucky and repair the board using schematics I see on the web...in which case I can mess with the signal-measurement pin13 circuit and Harbor Freight meter using a 455 kHz signal generator rather than a TMCC base. Whether or not I get it running I'd return it - your worst case out-of-pocket would be ~$3 for USPS First Class package shipping.