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Tough call. Some Carrera's have a tendency for valve guides wearing early. I had an '86 engine that needed guides at about 75,000, others are still running untouched at close to 200,000. It could just be carbon keeping the valve from closing, but it might be carbon from oil leaking past the valve guide. PPI should have specified where the air was leaking from. If the air is leaking out the intake, exhaust, or rings into the case.
Can you have the owner take the car for a good drive and recheck the cylinder? What do the spark plugs look like? If heavy oil deposits then it might need the guides replaced, which amounts to a top end.
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Ed
1973.5 T
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