As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING THE INSPECTION OF THE HEATER FUEL REGULATOR VALVE P/N A23D04 (PIPER P/N 461-731) AS REQUIRED BY AD 2001-17-13, THE VALVE WAS FOUND TO LEAK BY VISUAL INSPECTION. THE LEAKAGE WAS NOT EVIDENT UNTIL THE VALVE WAS REMOVED FROM THE SHROUD. THE VALVE WAS REPLACED WITH A NEW VALVE AS REQUIRED.