What was found
(CAN) GEAR SELECTED UP, RED IN TRANSIT LIGHT STAYED ON AND HYDRAULIC PRESSURE LIGHT ON. NOSE RETRACTED, BUT MAIN DID NOT. HYDRAULIC LIGHT THEN WENT OUT. BOTH MAIN LANDING GEAR DOWNLOCK GREENS CAME ON. GEAR SELECTED DOWN PRIOR TO LANDING AND ALL 3 GEARS DOWN AND LOCKED. INVESTIGATION FOUND THAT BOTH UPLOCK SWITCHES HAD A HIGH RESISTANCE ACROSS CONTACTS. SWITCHES SENT TO CESSNA FOR CHECK. PART TC: 2,780.