As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER SELECTING FLAPS UP, AMBER FLAPS FALL LIGHT CAME ON. UNABLE TO RESET. RETURN TO DTW. SLATS OK. ZERO FLAPS. ICE, WATER AND SAND FOUND IN THE LT AND RT INBOARD FLAP WELLS AND FLAP TRACKS. CAUSED FLAP MOTOR OVERCURRENT DURING FLAP ACTUATION.