As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN ANNUAL INSPECTION, THE VERNATHERM VALVE WAS REMOVED FOR INSPECTION TO COMPLY WITH LYCOMING SB 518C. THE VALVE PN 75944 HAD A LOOSE CRIMP NUT AND VALVE CONE HAD A WORN GROOVE. INSTALLED NEW VALVE PN SL53E19600 WHICH HAS DRILLED NUT AND ROLL PIN. RECOMMEND SB 518 BECOME AN AD.