What T7 said is pretty much right on the money, assemble, attach the grip, drop in motor and test. I've done the same when I had the chance to play around with both a merf and nanoAB.
If you are getting power and the burst function is working correctly then I would say it is safe to assume it is a mechanical issue. Being that it is semi that isn't working I would also be inclined to say start with the selector plate and go from there. Since you are getting a new switch assembly I would say give that a shot after the selector plate if the issue is still present.
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