Updated 11/5/2019:
Because (to my mind) keeping busy is better than dwelling on the sad events of last weekend, I decided to test a few CAB-1's that I acquired as well as my Power Distribution Panel. Accordingly, I connected all the transformers (2 PH135s and 6 PH180s) to their respective power districts.
As can be seen below by their indicator lights, Power Districts 2, 3, 4, 5, 6, 7, and 8 all fired up correctly. The TPC-400 that operates District 1 has failed for some unknown reason. It is exhibiting the same problems as the TPC-300s and TPC-400 I tested this summer. It won't take an ID or respond to commands. I am planning to replace it with a Legacy Powermaster (6-37146).
More when I know it.
George