As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4211 - DURING TAKEOFF ROLL, CREW REPORTED ELECTRICAL ARCHING UNDER FLIGHT OFFICERS INSTRUMENT PANEL. TAKEOFF WAS ABORTED AND AIRCRAFT RETURNED TO GATE. INVESTIGATION REVEALED THE WIRE BUNDLE FOR THE LEFT WINDSHIELD HEAT CONTROLLER HAD CHAFED ON THE CONTROLLER MOUNT BRACKET, WIRING WAS REPAIRED IAW ATR WIRING MANUAL. OPS CHECK WAS SATISFACTORY. A/C RETURNED TO SERVICE. (M)