My 2 cents on that would be that I've heard of some having varying levels of success with rebuilding (As Andy Said), so my reaction is why bother wasting time with a process that doesn't have a high success rate?
Who wants (or needs) to be going back over and over to repair the same issue - particularly when the unit we're talking about just isn't very expensive.
As for interchangeability......There is no compatibility across generations of machines to the best of my knowledge.
I remember once trying a C2800 K pump in a C3500 (or vice versa) and it didn't work.
However, if
I remember correctly, you can swap the Y/K pumps, and also the C/M pumps within the same model range. I believe the only difference being length of the hose that comes with them.
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