As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 4258 - WHEN LANDING GEAR WAS SELECTED DOWN FOR LANDING, ALL THREE GEAR REMAINED UP WHILE INTRANSIT LIGHT ILLUMINATED AND HYDRAULIC PUMPS RAN WITH NORMAL PRESSURE. CREW CYCLED GEAR WITH SAME RESULTS. LANDING GEAR WAS EXTENDED USING EMERGENCY PROCEDURES. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED LANDING GEAR CONTROL VALVE. SYSTEM TESTED GOOD. AIRCRAFT RETURNED TO SERVICE. (M)