What was found
OIL PRESSURE LOSS WHILE PREPARING FOR APPROACH INTO DESTINATION AIRPORT, THE CREW NOTED A LOW OIL PRESSURE WARNING LIGHT WITH THE OIL PRESSURE GAGE READING SLIGHTLY BELOW 40PSI. THE POWER WAS REDUCED UNTIL THE WARNING EXTINGUISHED AND AN UNEVENTFUL LANDING FOLLOWED. GROUND INSP FOUND A HEAVY OIL LEAK FROM A PRESSURE TUBE UNDER THE ENGINE. TROUBLESHOOTING IS ON-GOING TO FULLY UNDERSTAND THE SOURCE OF LEAKAGE.