What was found
(CAN) CREW REPORTS ON APPROACH WHEN THEY SELECTED THE LANDING GEAR LEVER DOWN THEY RECEIVED A GEAR DISAGREE WARNING MESSAGE. COMPLIED WITH QRH AND CYCLED THE GEAR LEVER SEVERAL TIMES WITH SAME RESULT. EACH TIME WHEN THE GEAR LEVER WAS SELECTED DOWN NO ACTION OCCURRED ON ANY GEAR. CREW PULLED MANUAL GEAR RELEASE HANDLE IAW THE QRH AND ALL LANDING GEAR EXTENDED. ACFT LANDED SAFELY. UNIT, ELECTRONIC, SENSING, PROXIMITY, PN: 8-953-04 LEVER, LANDING GEAR, PN: 53344-3, VALVE ASSY, MLG SELECTOR, PN: 53340-7.