As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE STARTING ENG 1 AFTER ENG 2 START ECAM GAVE VENT AVNCS SYST FAULT. AS WE STARTED TO TROUBLESHOOT AND WERE PULLING FCOM UP, FLIGHT ATTENDANTS IN AFT REPORTED DETECTED SMOKE. FIRE DEPARTMENT WAS ASKED TO RESPOND AND PASSENGERS WERE DEPLANED VIA L1 AND L2 BY AIRSTAIRS.