Load testing is fine but again we need the resting DC voltage after the car has sat all night. Engine not running.
Have you checked for current drain?

Attached is what Jaguar released and you may have seen it already. Chasing these draws is difficult and some have never found the root cause.
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I've lost count on the number of times we've emphasized "resting voltage reading".
Who was that, that coined the acronym ITBS. I really liked that one.

 

Is that "irritable bowel syndrome" ? or something....

 

We’ve been over that too,..
That the car oriented acronym could be a catalyst for the medical situation.