PPI from non-dealers?

[HIFI]

Any advice on getting a PPI from a non-dealer; ie. do they do anything special that an independant mechanic wouldn't?

I have a mechanic that has been working on Porsches for over 20 years who has offered to do an inspection for free if I take the car there for service. I am inclined to trust him, due to his reputation and sponsership of the local PCNA. However, I am a tad skeptical that a full inspection would be done at no charge.

Anything specifically that I should ask him if he does? (I doubt that the 4 wheel laser alignment would be included!)

Thanks!