I have lost water pressure in my bathroom sink, it is the only place in the entire house where water pressure has dropped. Why and what can I do to fix this problem ?

You need to remove the aerator (screen assembly) at the end of the spout and clean it out... then replace.. should be good to go.

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If its both hot and cold at the same time MASS has identified the issue. Is it both hot and cold and just at this one sink?