As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LIT - FLIGHT 2627 - AT 36000 FEET THE CREW REPORTED THE CAPTAINS AIRSPEED TAPE IAS TO BE +-6 OFF OF THE F/O'S SIDE FOLLOWED BY BOTH THE F/O'S AND CAPTAINS AIRSPEED AND ALTIMETER FALLING TO ZERO INSTANTLY WITH A LEFT TO RIGHT YAW. THE CREW DEACTIVATED THE YAW DAMPNER, AND LANDED AT LIT WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LEFT HAND VENTILATION SHUTOFF VALVE IN THE FORWARD AVIONICS COMPARTMENT, OPERATIONALLY CHECKED ALL SYSTEMS WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.