As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF. AIRCRAFT DUMPED 1000 LBS FUEL FOR LANDING WT REQUIREMENTS. AIRCRAFT LANDED NORMAL. FOUND LANDING GEAR ELECTRO VALVE AT FAULT IAW FIM 32-30-00 FIG 104 PG 102. REMOVED AND REPLACED LANDING GEAR ELECTOR VALVE IAW 31-31-12, SYSTEM FUNCTIONAL CHECK SATISFACTORY IAW 32-31-12 PG 601. AIRCRAFT RETURNED TO SERVICE.