As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED DUE TO AT FL350, NOTICED AN ELECTRICAL BURNING ODOR IN THE COCKPIT. NO ECAM, ALL SYSTEMS NORMAL. PERFORMED A SMOKE ODOR INSPECTION IAW TSM 24-00-00-810-823A. FOUND THE AVIONICS VENT EXTRACT FAN 18HQ EMITTING A BURNED ODOR. R & R THE BUTTERFLY VALVE 21HQ IAW AMM 21-26-54. R & R THE AVIONICS FAN IAW AMM 21-26-51.