I just tried spinning the tub by hand--no squeaking, but there was a little noise--like a gentle ticking?
It definitely squeaks during the wash cycle, and I think it's not as noticable during the spin.
Also, last night it made a large groan at one point in the wash cycle. We paused the wash cycle, but it didn't make that noise when moving the tub by hand, and the noise didn't return when we started the wash again. It didn't make that noise when washing today either.
I think it may also be leaking. I'm planning to pull it out and investigate the leak later today.
thanks again for your help!