Remove the springs from the piston blocks. You can depress the spring under a press ( or drill press even) to remove the retaining ring. The spring hole is a great cavity to hold contamination. Use a metal edge to scrap it then solvent on a white rag. That will give a clue as to past wear. I would also definitely remove the swash cradle spring pins on the trunnion shaft. It's usually two pins, so make sure to get the bottom one out of the way before driving the second one all the way through.
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