As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN REPORTED THAT AT THE BEGINNING OF THE TAXI, APPEARED THE AIR SPEED A/S FLAG IN THE LT AIRSPEED INDICATOR. IT WAS PERFORMED A RESET AND THE CADC SWITCH WAS CHANGED OF POSITION, BUT THE TROUBLE CONTINUED. AIR SPEED INDICATOR WAS REPLACED AND SYSTEM TESTED IAW M/M 34-13-00, ALL CORRECT.