As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEADING EDGE FLAP ASYMMETRY DISPLAYED UPON SLAT RETRACTION, SLATS LOCKED OUT. AIRCRAFT RETURNED TO FIELD. *S/D* A FAULTY SLAT PROXIMITY SENSOR CAUSED THIS DISCREPANCY. REPLACED PROXIMITY SENSOR, OPERATIONS CHECK NORMAL. PERFORMED PSEU BITE CHECK, FOUND NO FAULTS.