As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS REPORTED A CRAYON TYPE BURNING SMELL DURING APPROACH AND TAXI AFTER LANDING. SMELL DISSIPATED AFTER SINGLE ENGINE TAXI - MAINTENANCE FOUND THE APU GEARBOX VENT LINE HAD EVIDENCE OF COKING AND REPLACED IT *AALA202610104335* - MAINTENANCE REPLACED THE APU GEAR BOX AIR OIL SEPERATOR CARBON SEAL *AALA202610108681* - MAINTENANCE FOUND THE APU FCU WAS LEAKING AND REPLACED IT *AALA202610108558* A DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM WAS ACCOMPLISHED PER JOB CARD 26L00021014