As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3581 - DURING APPROACH INTO IAH THE CREW COULD NOT GET THE LANDING GEAR EXTENDED. ON THE THIRD ATTEMPT THE GEAR EXTENDED AND THE AIRCRAFT LANDED AT IAH WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR CONTROL HANDLE. THE GEAR SYSTEM OPERATIONALLY CHECKED GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.