Hi Steve. Looks like I solved things. Phased the KW'S and still had same events. Looking at KW #2 where 6924s were hooked to accord post, I noticed a small Crack in plate behind posts A and it's U.
Moved 6924 power/common over to KW #1. Trains still running on KW #2. Problem appears to be solved with the 6924s randomly opening. 57's 4 to 6 ate still a brighter red than 1 to 3. Seems to be a minor issue if anything at all.
What is curious is that I'm not sure the Crack is anything but a crack in Bake-Post backing post. I'll experiment with a 3rd backup transformer.
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