Lexx is right, I know the app I used for me bike was only out by a couple of dbs, so gave an idea. 88 is quite low, snetterton is about 95 I think and it's an exponential scale. 88 must be like a whisper.
I`m not sure. It is on the check list but so are several other things that I`m not convinced they bother doing. Just to access it`s general road driving maybe ? Excuse for the mechanic to razz it round (and sometimes crash it) ??
If I had a 370, I make sure I sat in with any mechanic test drive.