As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOTED OIL LEAKAGE AROUND LOWER N2 SPEED SENSOR DURING SCHEDULED INITIAL AIRFRAME/ENGINE INSPECTION. FOUND O-RING SEAL MISSING FROM SPEED SENSOR (REF. JT15D-5/-5R IPC 73-20-05 FIG. 1, ITEM 30). ENGINE RECORDS NOT AVAILABLE, CANNOT VERIFY WHETHER SENSOR REMOVED OR REPLACED SINCE INITIAL ENGINE BUILD.