As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT AFTER PLACING THE LANDING GEAR HANDLE IN THE UP POSITION, THE LANDING GEAR DID NOT RETRACT WHILE THE GEAR DOORS INDICATED OPEN. CYCLED LANDING GEAR HANDLE AND ALL INDICATIONS WERE NORMAL. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE NR 2 LANDING GEAR CONTROL INTERFACE UNIT AND THE LANDING GEAR SELECTOR VALVE, OPERATIONAL CHECK OK.