I always was under the impression when I saw this on a flight status, something was probably seriously wrong with the plane. But seeing it now everyday made me realize otherwise.

Last week my IAH-EWR was delayed an hour due to aircraft maintenance... Reason why.... Overhead bin above 3B in F wouldnt close right. Had to wait for the hinge to arrive.

Last month my LAX-EWR was delayed 45 mins due to maintenance.. Reason why... Sink in bathroom in F wouldnt shut off. Had to wait for plumber.

So thought it would be interesting to see what the actual reason was your last flight was delayed due to maintenance.