As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE DFW TO DCA - DURING CLIMB-OUT, THE LANDING GEAR WOULD NOT RETRACT. THE FLIGHT RETURNED TO FIELD IN DFW AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE TROUBLESHOT SYSTEM, REMOVED AND REPLACED LANDING GEAR CONTROL LEVER. LANDING GEAR OPERATIONAL CHECKS DURING GEAR SWINGS ARE GOOD.