Ordered the Service Machine Control WD21X24901C / AP7215773 from APP after doing research on this error code. Had previously replaced the door lock module that did not fix the problem (at the time didn't know about this error code or this part). Should have done a great deal more research but went for the easiest and cheapest fix--big mistake!
Ordered the part from APP and chose standard shipping. To my surprise, the part shipped the day I ordered and arrived THE VERY NEXT DAY!!!!
THANK YOU APPLIANCEPARTSPROS!!!!!