As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6532 - IAD-ORF - ABORTED TAKEOFF DUE TO THE TAKEOFF CONFIGURATION WARNING SYSTEM ACTIVATING DURING THE TAKEOFF ROLL. AIRCRAFT RETURNED TO GATE WITH NO FURTHER INCIDENTS. MX FOUND PIN AT CONNECTOR PR58R LOOSE. REINSTALLED PIN A INTO CONNECTOR, OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)