did he air them up to about 50? Did he take the wheel off the car and
put it in a water tank and carefully look for bubbles? My guess is no,
usually we just look at the tread to try and find a nail or something,
and usually you do find something.... and check the valve stem with
soapy water......If you dont see anything that way, it helps to over
inflate a bit then dunk it in water......when I did alot of tires I had
a spray bottle with soap I used to find the leak. I would raise the car
(A lift is nice

and look for anything to spray. If all else fails take
it off to dunk. I would suspect most people would look and if they didnt
see anything they will tell you "I cant find anything, watch the pressure."