When I first started working on the power top I saw that the pump had a big leak. I took it apart and saw that the big O-ring was crooked. I straightened it out and replaced it so the leaky part was at the top in air, not fluid. That worked OK but there was still some weeping at the O-ring. While I played with the system I ordered a re-build kit which has all the O-rings, new ball bearings, new rubber feet, and a new plug. Now that I know the rams are not leaking I will go ahead and fix the pump. Do as the manual says and scribe a line on each half so it can go back together in exactly the same way. There is a big bolt on the end that has a small O-ring on it. I replaced that just because it was off but I did not open the pump. It is working so I left it alone. I cleaned the reservoir and pump head making sure no O-ring debris remained. The reservoir had gummy crud inside along the bottom. It took lacquer thinner to dissolve it way. Once all clean I wrapped the new O-ring around the pump end, and installed the reservoir half lining up the scribe marks. Tighten the big bolt, re-attach the hoses, fill with ATF, [a small squeeze bottle works great] and bleed the air out again. It works! No leaks, and the rams move smoothly. I replaced two rubber feet that were broken off. Look at the hoses- no air. If I can install the entire assembly into the car without having to disconnect anything then I can see if the top moves as it should under power.