What was found
WHEN LANDING GEAR SELECTED DOWN DURING APPROACH 4 RED GEAR UNSAFE LIGHTS ILLUMINATED. SYNOPTIC DISPLAY INDICATED GEAR UNSAFE. AFTER APPROX 2 MINS, CYCLED GEAR UP AND BACKDOWN, ALL 4 GEAR INDICATED SAFE AS GEAR CAME DOWN SEQUENCE WAS NOTICABLY SLOWER THAN NORMAL. AIRCRAFT REMAINS OUT OF SERVICE, POSSIBLY FERRY FLIGHT TO SDF. FOUND GEAR HANDLE MECHANISM DIRTY CLEANED MECHANISM & GEAR HANDLE SWITCH, LUBED HANDLE AND BEARING OPS CK NORMAL GEAR PER 32-31-00.