As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ODOR OF SMOKE REPORTED IN THE AFT CABIN OF AIRCRAFT. THERE WAS NO SMOKE VISIBLE, ONLY THE SMELL OF A FAINT BURNING SMELL AND NO MEDICAL ATTENTION WAS REQUIRED. THE DURATION OF THE EVENT WAS NOT REPORTED. / TROUBLESHOT ODOR OF AFT CABIN IAW CRJ 900 FIM 21-22-00-810-806. WENT THROUGH ALL POSSIBLE CAUSES, NO DEFECTS NOTED. NO ODOR WITH PACKS, ENGINES OR ALL ELECTRICAL ON.