[OhioSkymaster]

Still fighting this problem. Tried the bleeding process mentioned below, no joy. We recently jacked the plane and, after some false starts, found that the right mains up switch was not functioning properly. The plunger of the switch was depressed per the manual, but we found that it was open-circuit when measuring voltage around the daisy chain. I pressed on the switch plunger a bit and, lo and behold, the switch made contact and I heard the door actuator solenoid engage. We replaced the switch and cleaned the terminals. Under test with a mule (electric motor driving the same type of pump as installed on the plane) we cycled the gear 10 times and it worked perfectly. Then I flew and had the same darn problem. The pump was recently rebuilt by Aircraft Accessories of OK, us thinking that it might be the problem but no change. Any ideas? Also, any recommendations for a shop in or near Ohio with expertise on the Skymaster landing gear system?