Update:

I put the spray arm back on. I had tipped the dishwasher on both sides to see if I could see anything. A lot of water spilled out when it was on either side and the water came out of the filter assembly mesh area.
Also, I had the filter assembly mesh out and shook it and there was still water in there. I don't know if that matters.
Anyway, I turned the power back on to the dishwasher and the drain pump stayed off. I ran a 15 minute rinse only cycle and it went through the process fine and drained properly. I'm not convinced it's fixed, though.
I realize having the water pour out while on it's side emptied it but where would the water be hanging up? While running the rinse cycle I kept an eye on the underneath of it and saw no leaks. Could there be a small clog in the drain hose that would cause this backup but still partially drain?

HI.

You probably still should replace the float switch asm. and also clean filters and drain nose.

Simon.

Hi.

I don't think you need to replace the sump.

Simon.