WDTA50SAKZ tech sheet?

WDTA50SAKZ sprayer arms do not appear to be spinning, though it is "raining" inside, and I did get a face full of spray when I tried to sneak a look inside before it fully turned off. I've seen other answers here direct to a tech sheet with diagnostic codes, like pressing 1-2-3-1-2-3 in quick succession, but this doesn't have number buttons. Is there one for this dishwasher before I start dismantling it without really knowing what I'm doing? The Whirlpool manuals troubleshooting seems to consist of "Not working? Call a service technician!" with virtually no home diagnostics at all. Thanks.