As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3810 - LANDING GEAR FAILED TO EXTEND WHEN SELECTED. EMERGENCY EXTENSION WAS SELECTED AND THE GEAR EXTENDED. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. REMOVED AND INSPECTED GEAR SELECTOR VALVE. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (M)