As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING APPROACH A LOUD BUZZING SOUND AND BURNING SMELL ODOR COMMING FROM THE AVIONICS COMPARTMENT WAS NOTED BY THE FLIGHT CREW. THE NOISE AND ODOR CONTINUED AND GOT STRONGER AFTER LANDING AND TAXING TO THE GATE. ABOUT 1 MINUTE AFTER SHUT DOWN A LOUD BANG WAS HEARD AND AN ECAM EXTRACT FAN FAULT MESSAGE DISPLAYED. MAINTENANCE REPLACED THE EXTRACT FAN AND ACCOMPLISHED A SATISFACTORY OPERATION CHECK.