As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YYJ - FLIGHT 7400 - AFTER LANDING, THE FLIGHT ATTENDANT NOTICED A RAW FUEL SMELL IN THE AIRCRAFT. DURING TAXI AND SHUTDOWN THE SMELL INCREASED. MAINTENANCE RAN BOTH ENGINES FOR 10 MINUTES WITH THE BLEEDS ON AND NOTICED NO FUEL SMELLS. NOTICED LARGE AIR LEAK AT APU JOINT. PLACED APU ON MEL 49-00-1. RETURNED TO SERVICE. REPLACED THE APU. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.