As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DOWN DISAGREE ON APPROACH - LEFT MAIN GEAR. PERFORMED QRH PROCEDURE, LEFT MAIN GEAR EXTENDED NORMALLY. REMOVED AND REPLACED MAIN LANDING GEAR SELECTOR VALVE WITH SERVICEABLE UNIT IAW CRJ MM 32-32-10. LEAK CHECK AND OPS CHECK GOOD.