Sliding door window motor going bad?

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2012 Mazda5 Sport AT
My 2012's passenger-side, sliding door window is going wonky. Sounds like it's loose, rolls down very very slowly and just kind of goes down by itself at the bottom, then has trouble rolling up. I think the shop that did the repairs on that door after a tire strike could've ****** it up when they took apart the door. I started to disassemble the interior of the door earlier to look around, but got stuck after taking the door handle panel off. Anyone have advice on how to disassemble everything? And has anyone else had issues with their sliding door windows?
 
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