Got a new thermostat and temps are still a bit elevated on the OBC (96c)

Did a coolant pressure test and lost 1 psi in the first 5 minutes, and losing more as time went by.

Looked all over and no leaking. Looks to be internal.

Crap! Head gasket? Am I screwed?

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04 X5 3.0i auto
03 X5 4.6is