What was found
PILOT WRITE UP, AFTER TAKEOFF WHEN THE LANDING GEAR HANDLE WAS BROUGHT UP, THE ONLY INDICATION WAS THE RED LIGHTS, GEAR HANDLE LIGHTS, THE GREEN LIGHTS. CREW NEVER HEARD THE GEAR DOORS OR THE GEAR MOVE, REF QRH AND RETURNED TO FIELD, CYCLED GEAR TWICE. MAINTENANCE COULD NOT DUPLICATE PROBLEM AND CHANGED THE LANDING GEAR SELECTOR VALVE AS A PRECAUTION. OPS CHECKS AND FUNCTIONAL CHECKS GOOD.