Thanks for your help! I'll post back here to let you know if the part works.

My dishwasher wasn't draining, so I took apart and cleared out the sump and micro-filter drain per instructions on this post.

Unfortunately, it didn't work, so I pulled the dishwasher out and checked the drain hose and red one way valve. Still not draining.

The last bit of info is that during what I think is the drain cycle, there's a hum/buzz sound coming from what I suspect is the pump.

Are there any other troubleshooting steps? or am I stuck ordering something like this, for $175? Is there a cheaper part that might be available?

Thanks!
Mark