Hi Joepan12. Welcome to the forum. This is a cable-driven system like is found in most vehicles now. If a plastic pulley cracks, the cable can become frayed and tangled. I never actually had to repair one, but I saw a lot of coworkers squatting down while chasing the coiled-up spring across the floor of the shop! I guess they can be pretty frustrating.
I've seen web sites listing rebuilt window regulators, otherwise this will be a dealer item. The entire assembly with pre-strung cables is replaced as a unit. If you have to use your old motor over, be careful if / when you pop the cover off. That's where the wound-up spring lives, and he's just waiting to escape.