As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRST OFFICERS RED MASTER WARNING FLASHED ON TAKEOFF, NO OTHER INDICATIONS. TAKEOFF WAS ABORTED AND AIRCRAFT RETURNED TO THE GATE. MAINTENANCE CLEANED AND RERACKED PRINTED CIRCUIT BOARD NR 2. RAN THROTTLES SEVERAL TIMES AND PERFORMED OPS CHECK OF CONFIG WARNING, OPS CHECK GOOD.