What was found
INBOUND, ON FINAL APPROACH, RECEIVED GEAR DISAGREE WARNING MESSAGE, RAN QRH, PULL MANUAL RELASE HANDLE, DECLAIRED EMERGENCY, LANDED SUSCESSFULLY, TAXIED TO THE GATE. (EMERGENCY DECLARED) ( LANDING GEAR RETRACTION SYS ) R & R MLG SELECTOR VALVE IAW AMM 32-32-10. OPS CHECK GOOD, DEFER CLEARED PLACARD REMOVED.