[arob]

Thanks for the input, all. I'm not certain that the MC is toast, but here's my support to my assumption:

A couple days before the tech day at HBL, I swapped in the track pads, and decided to do a full flush. The L rear caliper kept showing air in the line, even after a good 1/2 bottle of Gold. I found a thread on here spot on to what I was experiencing, and assumed that this was my issue as well. Turned out a "main rear seal" (or something like that) had gone/started to head south.

When I returned home Saturday night / early Sunday morning, I checked the garage floor to make sure it didn't start dumping fluid then. The floor was dry and spotless. :-/