Hi @ct53 ,
Don’t know the answer but the here’s an image of the drain malfunction troubleshooting flowchart taken from the [https://drive.google.com/file/d/0BzIiBNwRIV4NMjE3Znk3SDMwSmc/view|service manual].
[image|2062592]
(click on image to enlarge for better viewing)
Also on p.13 it shows how to get into the test mode for the washer to test the various functions of the washer including the drain pump.
Hopefully a start.