I had my pump fixed and adjusted by Gus Pfister at Pacific about 10 years ago. I brought him the pump one day when I had the need to visit San Francisco on business (I talked TSA into letting me carry the pump on board from Atlanta...no way I would ever get away with that post 9/11 !) Gus is an amazing guy: honest and expert as in: if anyone knows more about bosch pumps I really don't know how it would be possible. He let me watch him go through the pump, replace a few parts from donor pumps of which he has hundreds in the shop (I had done the bone-headed move of removing the collar that attaches the throttle linkage, and put it back wrong causing bits and pieces to fly together/break off when I tried to start the car. Don't do that, please). It took him about 2 hours to repair, calibrate and bench test. He charged me $250 which seemed like a remarkably fair price. I would have paid that just to watch him work.
That's my experience anyway,
Best,
g