As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ODOR OF JET FUEL DETECTED DURING DTW APPROACH AFTER STARTING APU AND TRANSFERRING BLEEDS TO APU. INSPECTED APU FUEL LINES AND EXHAUST PIPE FOR EVIDENCE OF FUEL RESIDUE, PERFORMED OPERATIONAL CHECK OF APU WITH PACKS OPERATING. NO EVIDENCE OF FUEL LEAKS, FUEL SMELL OR ANY OTHER DISCREPANCY.