As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6501 - IAD-JFK - ABORTED THE TAKEOFF DUE TO THE TAKEOFF CONFIGURATION WARNING SYSTEM ACTIVATING. AIRCRAFT RETURNED TO GATE WITH NO FURTHER INCIDENTS. MAINTENANCE CLEANED THE PARKING BRAKE AND FLAP HANDLE MICROSWITCHES. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)