As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 3725 - PILOT REPORTED THE LEFT GEAR DID NOT RETRACT. THE AIRCRAFT RETURNED TO IAH AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND A LOOSE CONNECTION AT THE LANDING GEAR RELAY BOX, AND THE LEFT GEAR INBD SEQUENCE VALVE TO BE OUT OF ADJUSTMENT. MAINTENANCE TIGHTENED THE AFFECTED CANNON PLUG AND PERFORMED AN ADJUSTMENT TO THE LEFT GEAR INBD SEQUENCE VALVE. THE AIRCRAFT OPERATIONALLY CHECKED GOOD AND WAS RETURNED TO SERVICE. (X)