As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW DECLARED AN EMERGENCY, REPORTING SMELL OF SMOKE ON BOARD. WHILE THE AIRCRAFT POSITIONED FOR AN APPROACH, THE SMELL BEGAN TO DISSIPATE. THE AIRCRAFT LANDED SAFELY ABOUT 10 MINUTES AFTER DEPARTURE AND TAXIED TO THE APRON. MAINTENANCE INSPECTED AND FOUND APU OIL COOLER LINE NOT ATTACHED.