As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AVIONIC VENT SYS FAULTED ON ECAM DURING CLIMB. HAD SLIGHT BURNING ODOR UNTIL EXTRACT WAS PUT TO OVERRIDE, SKIN EXCHANGER ISOLATION VALVE INOPERATIVE IN THE OPEN POSITION. REMOVED AND REPLACED VENTILATION EXCHANGER ISOLATION VALVE IAW AMM 21-26-55. TESTED GOOD, NO FAULTS NOTED.