After seeing video on how to get apart door and replace latch hook, I ordered a new one from AppliancePartsPros.com. Part arrived promptly. Got into door and found that the little tab on the latch hook had not broken as is usually the case (per the video). In this case the anchor point for the spring to the door frame had broken. I took a 6" piece of floral wire and fabricated a small loop to catch the spring end on the end of the wire. I then threaded the plain end of the wire through an existing hole in the door frame about 1" below the desired place for the spring anchor and twisted it firmly in place. Then I hooked the spring into the loop and reinstalled the latch hook. This fixed the problem. I didn't really need a new latch hook, but it was cheap so I'll just keep it just in case.