As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 1252 IAD-BOS GEAR FAILED TO RETRACT ON TAKEOFF, QRH WAS FOLLOWED AND GEAR RETRACTED NORMALLY. ON ARRIVAL IN BOS THE GEAR OPERATED NORMALLY. MX FERRY FLIGHT TO JFK FOR TROUBLESHOOTING, JFK MX PERFORMED GEAR SWINGS AND DUPLICATED FAULT LGCIU FAULT CODE A152. REMOVED AND REPLACED LGCIU NR 1 IAW AMM 32-31-71-04. PERFORMED GEAR SWINGS FOUND SATISFACTORY AND CAT IIIB TEST WAS ACCOMPLISHED, AIRCRAFT RETURNED TO SERVICE.