What was found
DURING CRUISE FLIGHT PILOT REPORTS HEARING GONG AND "ENG P" LIGHT ILLUMINATED. INSPECTIONS END WITH POSITIVE RESULTS AND RELEASED ACFT FOR SERVICE. ON SECOND LEG OF THE RETURN THE GONG SOUNDED WITH NO ASSOCIATED LIGHT WITH AN INCREASE IN INTERVAL ON APPROACH UNTIL SHUTDOWN. "ENG P" THEN FLICKERED ONCE GROUND IDLE WAS SELECTED AND THEN WAS STEADY TO SHUTDOWN. BOTH TIMES OIL PRESSURE WAS NORMAL. DURING GROUND RUN UP WATER FROM HEAVY RAINS WAS OBSERVED FROM BELOW WITH A FLASH LIGHT SOAKING ALL THE CONNECTORS. CLEANED AND DRIED WITH NO FURTHER ISSUES. SUSPECTED WATER MIGRATION INTO THE CONNECTOR FROM DAYS OF UNUSUALLY HEAVY RAINS.