Bob,
1) the dot has nothing to do with import (greymarket) / nonimport status ... all modern Leicas come with a red dot. some owners for aesthetic reasons, have the dot custom replaced with a black dot. An easier and cheaper way is just to place gaffers tape over it if you don't wish to broadcast the Leica dot.
2) as far as I know Leica NJ will service import/grey Leicas. In any event, other great service specialists such as DAG (Don Goldberg) or Sherry Krauter will happily service ALL Leicas including import/greymarket bodies
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