As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, CREW REPORTED HAZE IN THE COCKPIT CAUSING EYE AND NOSE IRRITATION. THE AIRCRAFT RETURNED TO THE PARKING AREA/RAMP WITHOUT INCIDENT. MX COULD NOT DUPLICATE THE DISCREPANCY AFTER PERFORMING A VISUAL INSPECTION OF THE AVIONICS SYSTEMS COMPONENTS AND WIRING, ENGINE RUNS AND AIR CONDITIONING CHECKS WITH NO DEFECTS NOTED. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.