As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE - FLIGHT 5668 CREW REPORTED SMELLED SCENT OF SMOKE. PACK NR 2 DESELECTED AND SCENT WENT AWAY. AIRCRAFT RETURNED TO GATE. MAINTENANCE CONFIRMED AIR-CYCLE MACHINE SEIZED FOR NR 2 PACK. PLACED NR 2 PACK ON MEL. FLIGHT 5724 DATED 6/11/2009 MAINTENANCE REPLACED NR 2 AIR-CYCLE MACHINE, ALL OPERATIONAL CHECKS WERE GOOD AND AIRCRAFT WAS RETURNED TO SERVICE.