As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6433 - IAD-EWR - ABORTED TAKEOFF DUE TO THE TAKEOFF CONFIGURATION WARNING SYSTEM ACTIVATING DURING THE TAKEOFF ROLL. AIRCRAFT RETURNED TO GATE WITH NO FURTHER INCIDENTS. MX PERFORMED OPS CHECKS, BUT COULD NOT DUPLICATE DISCREPANCIES. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)