What was found
GEAR DISAGREE ON WARNING MESSAGE WITH ASSOCIATED AURAL MSG, GEAR SELECTED DOWN. SHOW BOTH MLG DOWN BUT NLG UP. RAN QRH CYCLED 2 TIMES AND CONDITION WORSEND ALL MML SHOWED UP AND WOULD NO COME DOWN. PERFORMED MANUAL GEAR EXTENSION. ENROUTE, ACFT DIVERTED DUE TO MAINTENANCE. LANDING GEAR RETRACTION SYS, R & R MLG SELECTOR VALVE IAW AMM 32-32-10, MK 7025811 EXTENSION RETRACTION CHECK OK. INDICATION INVALID. R & R PSEU OPS CHECK GOOD IAW AMM 32-61-01. DEFER CLEARED PLAC, REMOVED PSEU IPC 32-61-01, FIG 1 ITEM NR 5C IPC 32-32-10, FIG 1, ITEM 40B.