As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - AIR TURNBACK - RT MLG DID NOT RETRACT ON TAKEOFF, ALL GEAR DOORS OPERATED NORMAL. TROUBLESHOT PER FIM; REMOVED AND REPLACED THE RT. MLG DOOR UPLOCK AND DOWNLOCK SEQUENCE VALVES, PERFORMED GEAR RETRACTION TEST AND ALL FUNCTIONS NORMAL.