I just worked on my rear window repair. The glas fell down a week ago, last weekend I took the door apart and the good door apart to tell how the cable was routed. The regulator and motor are one piece for S187.00, I was able to repair mine because the cable cover had opned and allowed for the cable to come apart.
It sounds like you need a new register, easy to replace once you remover the door cover.

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Thanks, Juan