As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH FLAPS 1 SELECTED, THE FLAPS STOPPED BETWEEN 0 AND 1 ACCOMPANIED BY AMBER LEADING EDGE FLAPS ASYMMETRY LIGHT. THE FLAPS GRADUALLY MOVED TO MATCH. FLAPS LOWERED TO 15 USING ALTERNATE FLAPS. EMERGENCY DECLARED. LANDING UNEVENTFUL. AIRCRAFT GROUNDED. MAINTENANCE NOTED FSEU FAULT MESSAGE 27-52260. REMOVED AND REPLACED THE RIGHT FLAP POSITION TRANSMITTER IAW AMM 27-58-00. SYSTEM CHECKED NORMAL.