As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HIGH PITCH VIBRATION UNDER FLIGHT DECK FLOOR. ACRID SMOKE SMELL AND ECAM MESSAGE FOR AVIONICS BLOWER FAULT. SWITCHED TO OVERRIDE POSITION. VIBRATION AND SMOKE CLEARED. *S/D* VIBRATION WAS CAUSED BY THE AVIONICS COOLING FAN. VIBRATION AND SMOKE CLEARED AFTER COOLING FAN REPLACEMENT.