As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL QUICK DRAIN WOULD NOT SHUT OFF. FOUND 2 PARTS OF STEEL WASHER IN QUICK DRAIN. FOUND OTHER 2 PARTS OF WASHER IN PAN. WASHER IS FROM JUST BELOW LEVER SLOT OF PUMP WHERE IT SLIDES OVER PUMP VERTICAL PLUNGER SHAFT. THIS IS THE SECOND OCCURRENCE OF THIS FAILURE BY THIS OPERATOR (OTHER FAILED PUMP HAD 641 TSN).