As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL AT 80 KNOTS. THE AMBER AFT AIR-STAIR LIGHT ILLUMINATED. ACFT ABORTED TAKEOFF WHERE IT PRECEDED WITH OUT INCIDENT. POST FLIGHT INSP WAS PERFORMED, THE UPPER CONTROL HANDLE SWITCH DETERMINED TO BE AT FAULT. ITEM WAS DEFERRED AND ACFT WAS RETURNED TO SERVICE. NO OTHER DEFECTS WERE NOTED.