As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW DUE TO GEAR FAILED TO RETRACT AFTER TAKEOFF. AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT. MAINTENANCE CLEANED MANUAL SYSTEM ACCESS DOOR SWITCH PER MM 32-34-00. ACCOMPLISHED FUNCTIONAL ALTERNATE LANDING GEAR TEST PER MM 32-31-51.