As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3584 - CREW REPORTED LANDING GEAR DID NOT EXTEND WHEN SELECTED. COMPLETED SUCCESSFUL EXTENSION WITH EMERGENCY EXTENSION HANDLE. MAINTENANCE RAI'D L/G SELECTOR VALVE. PERFORMED OPS CHECK SEVERAL TIMES WITH NO FAULTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE. (M)