Okay, I'm inclined to believe something like the MID is randomly kicking on (hence the random electronic sound in the dash when car is asleep) because with fuse 75 pulled, the car has been starting fine. No apparent battery drain over long non-run periods (up to 4-day sit times tested so far). Today, I put the multi-meter back on the battery, and with fuse 75 out, the reading dropped to .02 amps once the car went to sleep. With fuse 75 in, the lowest it dropped was .14 amps once asleep -- so that indicates a .12 amp draw.

Question is, if I purchase a pre-owned radio/receiver and swap it out, will it solve the problem? I'm finding them on eBay for about $180. The pixels on my display are shot, so that would also be an improvement.

Anyone care to weigh-in further w/words o' wisdom?

Thanks for playing along! This has been more of a PITA than I bargained for....