The repair itself was a no- brainer...simply remove the top cover over the existing dirty filter ( by unscrewing two small Philips head screws), discard the old filter, and simply set the new filter into the slot. The tedious part of the job was that , due to my less than fastidious housekeeping duties, the top cover was pretty greasy...I guess I should remove it periodically and CLEAN IT!!! Lesson learned!!