As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED ON APPROACH INTO PHL DUE TO POSSIBLE OIL LEAK #1 ENGINE. LEFT ST THOMAS WITH 14 .5 QTS. ENROUTE THE OIL SLOWLY DISSAPATED DOWN TO .5 QTS AT PHL APPROACH CONTROL. ALL OTHER OIL INDICATIONS GOOD. AFTER LANDING OIL IN ENGINE ROSE TO 2.0 QUARTS. THE AIRCRAFT LANDED SAFELY AT PHL. MAINTENANCE FOUND THE #1 ENGINE HAD OIL ON THE THE RADIAL DRIVE SHAFT OUTER HOUSING DURING A BORESCOPE INSPECTION VIA THE STRUT 7 VENT HOLE. AND REPLACED THE ENGINE PER TASK CARD 26L40071001.