As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI FROM GATE CREW NOTICED AN UNUSUAL ODOR. COCKPIT ADVISED IT WAS EXHAUST FROM THE AIRCRAFT IN LINE IN FRONT OF THEM. COULD STILL SMELL ODOR 45 MINUTES AFTER TAKE OFF. ODOR RETURN UPON DECENT AND CONTINUED THROUGH DEPLANING. AIRCRAFT WAS GROUNDED. WHILE TROUBLE SHOOTING CABIN ODOR FOUND OIL LEAKING FROM APU GENERATOR AT FEEDER CABLE TERMINAL BOX AREA. REPLACED APU GENERATOR PER AMM 24-23-51.