I had the exact same thing on an E5000 HR. Ended up recording the LEDs on slow motion with one phone then same on a working unit with another phone. Went through frame by frame and I think you could see the key switch off position monitor go back on for a second before everything dropped out. Ended up being key switch wiring. I’ll have to find a print to refresh my memory of exactly what was going on. This did it from both key switches too.
