As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT 3014, ON TAXI IN AUTO SHUTDOWN OF APU. RESTART SUCCESSFUL. 5 MIN LATER MELTED PLASTIC SMELL IN COCKPIT ONLY. CORRECTIVE ACTION: FOUND AVIONICS BLOWER FAN W/ITH STRONG ELECTRICAL BURNING SMELL. REPLACED FAN PER A321 MM 21-26. REPLACED AVIONICS VENTILATION FILTER. (LP 5849566)