What was found
(CAN) GEAR DISAGREE ON LANDING APPROACH. RAN QRH-CYCLED THE GEAR 4 TIMES BEFORE TRYING THE MANUAL GEAR EXTENSION HANDLE, WHICH FINALLY MADE THE GEAR COME DOWN. IT WAS BOTH MAIN GEAR THAT STAYED IN THE UP POSITION. JACKED ACFT AND VERIFIED MLG WOULD NOT EXTEND. R & R MLG SELECTOR VALVE IAW AMM 32-32-10, PERFORMED NORMAL GEAR AND EMERGENCY FREEFALL, OPS & LEAK CKS GOOD. ACFT REMOVED FROM JACKS (SEE ALSO FAA SDR 2011091700752/SWIA201127180) (SDR 2011091700822/SWIA201127164).