As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GNDED. DESCENDING THROUGH 12000 LOUD HOWLING NOISE STOPPED, FOLLOWED BY CLASS 1 ECAM VENT BLOW FAULT. FLIGHT CREW FOLLOWED ECAM ACTIONS, VENT OVERRIDE OFF. THIS WAS FOLLOWED BY ELEC SMELL IN COCKPIT & FWD CABIN. REPLACED THE AVIONICS BLOWER FAN & ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK IAW AMM 21-26-51.