As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER STARTING THE TAKEOFF ROLE, THE UPPER YAW DAMPER "OFF" LIGHT ILLUMINATED. THE CREW PERFORMED AN ABORTED TAKEOFF AND RETURNED TO THE BLOCKS WITHOUT INCIDENT. POST FLIGHT INSP WAS PERFORMED NOTING THAT THE LIGHT COVER WAS STUCK IN SOCKET. PERFORMED GROUND TEST OF YAW DAMPER SYS, ALL CHECKS GOOD. NO OTHER DEFECTS NOTED. ACFT WAS RETURNED TO SERVICE.