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I lifted L7330 the short remains on the 2nd I checked all the leveling capacitors and don't pull down PPDDR_S3_REG at this point is something after the boardview would look like a rhophore under a ram, lifted the ram?
If you still insist on it, try injecting voltage on the 1V2_S3 power rail; R7350 is probably the easiest point to do it.
Remove CPU heatsink first; however not easy to detect CPU heating, if not pure short...
The sign of previous RAM reflow is easy to detect.
You didn't say anything about that before.
Spending time to change all RAM modules may be wasting time; in case of CPU internal problem.
I suspected that he had been reflowed at the ram because some capacitors were missing, I began to detach on one side and I was lucky that after 3 modules the short was gone