As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - EN ROUTE, ALL THREE LANDING GEAR WOULD NOT EXTEND WITH NORMAL EXTENSION SYSTEM. PERFORMED MANUAL EXTENSION. MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR SELECTOR VALVE. OPERATIONAL CHECK GOOD, AIRCRAFT APPROVED FOR RETURN TO SERVICE. PART TOTAL CYCLES, 6,062.