As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2804 - IAH TO MEM- DURING CLIMB THE LANDING GEAR DID NOT RETRACT WHEN SELECTED. THE AIRCRAFT RETURNED TO IAH AND LANDED WITHOUT INCIDENT. UPON INSPECTION THE RIGHT GEAR AIR GROUND PROXIMITY SWITCH WAS FOUND TO BE OUT OF ADJUSTMENT. MAINTENANCE ADJUSTED THE PROXIMITY SWITCH, FUNCTIONALLY TESTED THE LANDING GEAR EXTENSION AND RETRACTION AND THE DISCREPANCY WAS CLEARED.