What was found
NUMBER 1 ENG OIL QTY SLOWLY REDUCED TO 0 OVR 90 MINS ALL OTHER ENG IND. NORM AT THIS TIME. CAPT REPORTED THE OIL PRESSURE WAS 92 PSI UPON ENG SHUTDOWN AFTER LANDING CREW REPORTED ENG NR 1 OIL PRESSURE DROPPED DOWN TO 90 PSI. ACP'D ENG NR 1 INSPECT FOUND OIL COMING OUT OF VENT DRAIN FOR IDG DRIVE OIL SEAL DRAIN, WHILE THE ENG IS RUNNING. FOUND CORRECT IDG DRIVE SEAL INSTALLED REF IPC 72-61-04 -05 ITEM 45, REPLACED PACKING ON IDG DRIVE SEAL ASSY IAW AMM 24-11-01. REMOVED & REINSTALLED NR 1 ENG IAW AMM 24-11-01 ACCOMPLISHED ENG RUN & LEAK CHECK, OPS CHECK NORMAL NO LEAKS NOTED UPDATE FOR INSPECTION ACCOMP NR 1 ENG IDG FEEDER CABLE INSTALLATION IAW GMM 09-10-05 MAINT ACTION COMPLETED. ACFT OK FOR SERVICE.