As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOGPAGE:8648088 - FLT 867 - PHL-PUJ - AIR TURN BACK - LANDING GEAR CONTROL AND INTERFACE UNIT (LGCIU) 1 FAULT DURING CLIMB. RETURNED TO PHL. REMOVED AND REPLACED LANDING GEAR DOOR SELECTOR VALVE 41GA PER MAINTENANCE MANUAL 32-31-34. OPERATIONAL AND LEAK CHECK WAS GOOD.