Last one to post in this thread wins!

Hardest part is, I wouldn't know what to replace

The motor doesn't want to spin the impeller
So is the impeller sticking?
Or is the motor bad?
I would test the motor first, that is the most likely point of failure. I worked on swimming pools and to a lesser extent hot tubs one summer and typically the motor will fail from worn out brushes, much like a starter or alternator.