There are 3 good companies that overhaul the pumps , they are Aircraft Accessories, Quality Aircraft Accessories both in Oklahoma and the third is The Aviation Group in Peachtree Georga.
If you are looking to have your Power Pack or hydraulic Actuators overhaule I can do them for you. My Company is Cox Airparts in Wichita Ks look at my web page . I have moved so call me firsrt if you have any questions. Rick
www.coxairparts.com