As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLT 4175 - THE CREW REPORTED THE NOSE LANDING GEAR WOULD NOT EXTEND WHEN THE GEAR CONTROL LEVER WAS PLACED IN THE DOWN POSITION. THE CREW MANUALLY EXTENDED THE GEAR AND LANDED AT IAH WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR DOOR SOLENOID VALVE, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (X)