As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LANDING, FLAPS WOULD NOT EXTEND WHEN COMMANDED TO 1. DECLARED EMERGENCY AND RAN TRAILING EDGE FLAPS ASSYMETRY CHECKLIST. LANDED FLAPS UP AND EXTENDED LE FLAPS & SLATS VIA ALT FLAP SWITCH. MAINTENANCE REMOVED AND REPLACED THE FLAP SKEW SENSOR NR 3 IAW 27-59. PERFORMED OPS TEST OF FLAP SYSTEM, ALL NORMAL. ACFT OK FOR SERVICE.