What was found
AIRCRAFT REAR ENGINE WAS FOUND TO HAVE OIL LEAK WHICH WS TRACED TO FAILED SEAL IN P/N B51000AH300, OIL SUMP DRAIN VALVE. POSSIBLY CAUSED BY HIGH HEAT RADIATION FROM THE SURROUNDING, P/N 1555001-1, MUFFLER. SUBMITTER RECOMMENDED FREQUENT REPLACEMENT OF P/N BJ1000AH300 DRAIN VALVE DUE TO ITS CLOSE PROXIMITY OF THE MUFFLER. (X)