As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 4240 - THE CREW REPORTED THAT THE LANDING GEAR WOULD NOT RETRACT. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NR 1 HYDRAULIC SYSTEM PRIORITY VALVE AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)