What was found
(CAN) DURING GEAR DOWN SELECTION, MAIN AND NOSE GEAR DID NOT EXTEND. NOSE DOORS OPEN "GEAR DISAGREE" WARNING MESSAGE ON EICAS. GEAR INDICATION ON EICAS 3 WHITE BOXES. DURING EVENT CREW ALSO REPORTED "CAS MISCOMP" STATUS MESSAGE ON EICAS. DENOTING THE WARNING MESSAGE-DISAGREE BETWEEN GEAR POSITION AND HANDLE POSITION. CREW PROCEDED WITH QRH PROCEDURE-GEAR EXTENSION USING MANUAL RELEASE SYSTEM. GEAR EXTENDED AND LOCKED. LANDING GEAR CONTROL HANDLE ASSEMBLY REPLACED.