[DrVenture]

If the first symptom was that A/C stopped working, but the A/C compressor was not actually bad, I would assume that it lost power. They checked codes and assumed a bad compressor, but never checked that there was power at the compressor. So, the new compressor again had no power and they realized that the fuse was blown, at that point.

I think one would need to go over the circuit schematics to see how everything is connected. I do wonder where the HV voltage sensor is situated. And also wonder if all the codes were cleared, which ones come back. Ignoring any codes that are present because the fuse is open.

If the fuse is accessible, an ammeter could be placed across the terminals to see how much current is being drawn. And rechecked with either the heat or A/C power lead disconnected. The initial report implies they used a device to monitor this at some connector location(s) - "Measured resistance to each cable and each component with adapter and cannot identify the KLE branch down from internal short in system..."

If no short, or abnormal current draw were detected, it could be intermittent or the component with the short is on the other side of a de-energized relay. I don't think one can go any further without hands-on and documentation. Not enough information otherwise.

The codes that you just posted, from first dealer, also include some faults in the "convenience charging system" and low state of charge with the HV battery. No idea if those are related to the blown EME HV fuse.