After researching problem on APP web site and reviewing questions other customers had. Best guess was to replace the door lock switch assembly.This was done by removing the gasket spring retainer using needle nose pliers to pull the spring and remove it, then pull the gasket back on the side of the switch. Remove the 2 screws from the front of the switch with screw driver, pull the switch out through the front and unplug it. Then just reverse the process. Plug in new switch, tuck it back in opening, replace the screws (they are self tapping into plastic switch housing, do not over tighten). Replace gasket and secure with spring retainer. Machine finishes cycle with no alarm code.