As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH 6605 DTW - THE PILOT REPORTED AN UNUSUAL BURNING SMELL WITH THE BLEED ON. ON CALL MAINTENANCE WAS DISPATCHED AND TROUBLESHOT THE PROBLEM TO BE DE-ICE FLUID ON THE PACK DUCTS. MAINTENANCE CLEANED THE FLUID, RAN THE SYSTEM AND NO DEFECTS WERE NOTED. AIRCRAFT CONTINUED REVENUE SERVICE.