Ok, just to circle back on my dead 2011 Leaf issue from above, all is well. Finally cooled down outside enough for me to get a new PbA, new fob batteries, LeafSpy Pro, and a new OBII (iOS-compatible). I had an old $20 android phone and OBII with the free LeafSpy from back in 2013 or so, but I wanted to get everything running on an iPhone. Anyway, long story, but was able to finally get the codes cleared, and the car back in the garage, charging. One persistent code was for the brakes, which I discovered was related to low brake fluid (nothing was visible in the upper reservoir). So, my WAG analysis is that the old 10 y PbA became stressed by the +115F heat, and the low brake fluid because the pads are wearing more due to the abysmal regenerative braking (2011 Leaf with original 8-bar battery). It’s possible that the low fluid caused the brake lights to be on (this happened to me in my 1972 Dodge), but I doubt it (LED taillights can’t use much). The clicking relay is a mystery, but again guessing, maybe the low PbA voltage was such that the relay wouldn’t activate properly (maybe they need enough voltage or to stay open or closed). Anyway, after being disconnected from the PbA for several days, the relays seem to reset.
tl;dr. All is good. 65,000 mi and still running. The only maintenance has been PbA, brake fluid, 3x wipers, wiper fluid, 2x tires (new set put on last fall). Love that LeafSpy. Thanks Turbo!