As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH TO CRP - ON TAKEOFF, WHEN THE LANDING GEAR LEVER WAS SELECTED UP THE CREW RECEIVED A LANDING GEAR DISAGREE MESSAGE AND THE NOSE LANDING GEAR RETRACTED AND LOCKED, BUT THE MAIN LANDING GEAR SHOWED RED AND UNLOCKED. THE LANDING GEAR WAS SELECTED DOWN AND THE LANDING GEAR INDICATED DOWN AND LOCKED. THE FLIGHT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT THE FAULT TO THE MAIN LANDING GEAR SELECTOR VALVE, AND AFTER REPLACING THE VALVE, THE LANDING GEAR OPERATED NORMALLY.