I hope the MC rebuild works out for you. If you honed the bore of the MC to remove the wear ridge in the cylinder this may work out. My experience with a rebuild was on my 1987 745 turbo. It worked for about three weeks and then the piston seals failed again because I obviously had not honed the cylinder adequately to remove the wear ridge. After that experience I replaced the MC rather than attempt a second rebuild.
Unfortunately the Volvo green book provides no advice on checking the servo. The only test I am aware of is 'pull a vacuum on the line to the servo check valve and see if it holds a vacuum'. If the servo has a significant air leak then it has failed (notwithstanding the potential leak at the base of the MC which the green book says nothing about). If the servo holds a vacuum then it is not obviously broken. It may not necessarily be OK; but, not obviously broken.
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