As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 9800 - DURING APPROACH, THE LANDING GEAR WOULD NOT EXTEND WHEN GEAR WAS SELECTED DOWN. CREW WAS ABLE TO EXTNED LANDING GEAR AFTER USING LANDING GEAR MANUAL RELEASE AS PER CHECKLIST IN ABNORMAL SECTION VOL 1. MAINTENANCE REMOVED AND REPLACED THE MAIN LANDING GEAR SELECTOR VALVE IAW CRJ MM. OPERATIONAL CHECK WAS SATISFACTORY AND AIRCRAFT WAS RETURNED TO SERVICE. (M)