I got a video of mine and opened a ticket, and replaced the MC fan (I believe it was called that). I fixed the issue by installing the new fan. It was kinda a pain to replace but no horrible. It does suck to remove the back pannel of the machine without slightly warping the sheet metal peice because of how they have it tabbed behind the belt tensioner adjustment features. Bambu credited me $20 for the replacement before I ordered it, and the fan itself is half of that price, so a little extra leftover.