As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6281 - IAD-HPN - DURING TAXI FOR TAKEOFF, RETURNED TO GATE DUE TO THE LEFT AIR OFF LIGHT ILLUMINATING. AIRCRAFT RETURNED TO GATE WITH NO FURTHER INCIDENTS. MAINTENANCE OPENED DMI NR 07767 IAW MEL 21-1. IAD LATER CLEARED DMI NR 07767, BY REMOVED AND REPLACED AIR OFF PRESSURE SWITCH CANNON PLUG. OPS CHECKED GOOD. AIRCRAFT WAS THEN APPROVED FOR RETURN TO SERVICE. (W)