Ah, I understand now. That's really your call. I got a $200 PPI done at BMW Bridgeport CT on my first ZHP that said the A/C was broken and that it needed new belts (neither of which was true), needed a new GM to the tune of $1000 (with no symptoms), and went on to miss a non-functioning driver xenon headlamp, so going to BMW for the PPI doesn't even remotely mean it will be done correctly.