After a few web searches I determined the most likely problem was with the door latch. I was able to identify the part I needed on the AppliancePartsPro website - for less than $50. The part was delivered in less than 2 business days and only took 15 minutes to replace. Problem fixed! This is the third or fourth time I have used AppliancePartsPro and each time I have received quick delivery of the correct part. Based on my experiences, I would highly recommend ApplicancePartsPro.