As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A MODERATELY STRONG OIL / MUSTY ODOR. ODOR PERSISTED UNTIL DESELECTING PACK 1. AT THAT POINT ODOR REDUCED BUT WAS STILL PRESENT. AFTER LANDING SELECTING APU BLEED RESULTED IN STRONGER ODOR. NO ODOR IN CABIN. REMOVED LT & RT ENG SPINNER COVERS FOUND EVIDENCE OF OIL BUT NOT FROM THE WEEP HOLES. CLEANED AREA & REINSTALLED COVER PER AMM 72-11. B. FOUND OIL AT APU IGV ACTUATOR DRAIN AND INSIDE INTAKE PLENUM. DEFERRED APU PER MEL 4910-01A, (LP 9183682, 9183685 - AIRCRAFT WAS GROUNDED)