I just looked at a really, really nice low-mileage FB here in town and am harbouring the suspicion that one rotor is slightly down in compression. It's not much, but the guy is asking 'pristine' money and I'd need some sort of impartial check of the compression to see if it's worth my while and potentially as a haggling aid (which is why the usual poor man's compression test is out).

Anybody know a shop in the area that can at least be trusted doing a proper rotary compression check? I guess that probably means Mazda dealer, any suggestions or horror stories?