As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS DURING FLAP EXTENSION, FLAPS STUCK BETWEEN 15 AND 25. L/E LIGHTS AGREED WITH TRAILING EDGE POSITION. FLAPS LEFT DOWN AT GATE FOR INSPECTION. MAINTENANCE ACCOMPLISHED TASK IAW FIM 27-51-00-810-849. NO FAULTS NOTED.