I have a 78 Turbo Arrow. A couple months ago, the gear started acting up. Sometimes I would flip the gear switch and the gear would not even attempt to raise. Sometimes I would flip the switch and it would raise part of the way and then stop in mid-retraction with the warning light on. The shop lifted it this week and cycled the gear several times without a load and the gear worked fine. However, when they put load on the gear simulating wind pressure, they found that the gear pump stopped while retracting. Two key details. The gear was supposed to have been overhauled about two years ago (before I bought the plane). During the overhaul, the low-speed switch that would automatically extend the landing gear was removed via Piper STC. That's the switch that could cause the gear to extend unexpectedly. The shop is thinking the pump needs to be overhauled or replaced and it is quite an expensive proposition. The service manual indicates the pressure switch may be out of adjustment or an obstruction in the hydraulic system. Any other thoughts on this?