As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PHASE 1 INSPECTION, FLAP MOTOR OPERATIONAL TEST, THE LEFT MOTOR WOULD NOT DRIVE FLAPS. THE FLAP DRIVE WAS INSPECTED AND LEFT SPROCKET WAS FOUND BROKEN IN TWO. THIS CAUSED MOTOR TO BE INEFFECTIVE. NO BINDING OF FLAPS WAS FOUND. THE SPROCKET WAS REPLACED WITH A NEW UNIT AND OPERATIONAL TEST WERE SATISFACTORY.