As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ODOR IN AFT CABIN WHEN PACKS OPERATING ON APU .THE ODOR REOCCURRED ON TAKE OFF THROUGH ABOUT 5000'AGL. APU OFF CABIN ODOR QRH CONDITION A DIRTY SOCKS ODOR REOCCURRED ON DESCENT OUT OF FL.180 WITH THRUST AT IDLE. THE AIRCRAFT WAS GROUNDED. FOUND OIL LEAKING FROM THE OIL COOLER TRANSFER TUBES. REPLACED THE O-RINGS IAW AMM 49-91-44. OPS CHECKED GOOD, AND NO LEAKS NOTED AT THIS TIME.