What was found
EMERGENCY LANDING INTO DCA. CREW REPORTED A LT OIL PRESSURE MESSAGE 4 MILES OUT FROM DCA. LT ENG STARTED LOSING THRUST. CREW REDUCED LT ENG TO IDLE AND LANDED SAFELY. CREW KEPT IT IN IDLE ALL THE WAY TO THE GATE. MX SERVICED LT ENG 5.5 QT FOUND OUT OF LIMITS CW OIL CONSUMPTION RUN IAW AMM OPS CHECK GOOD. CW POWER ASSURANCE CHECK RUN IAW AMM OPS CHECK GOOD. MX LATER REPLACED LT IDG CARBON SEAL P/N 4138T09P03 S/N 5BA90251, LT EDP CARBON SEAL P/N 5018T70P02 S/N5BAR5326, LT ATS CARBON SEAL P/N 5018T49P05 S/N 5BAR5343.