Nah, the fan still is operational, it's just the tower may have been bent around the mesh a bit, and grinds against it, but it does still work, the front, rear, CPU and PSU fans all operate just fine still. The heatsink isn't a problem and not really something I'm focusing on, just the top fan I took out due to it grinding and hitting the inside of the case, it was really annoying. I might need to wedge or bend it to there's space.
Oh, the top fan isn't your heatsink fan? Sorry.
Mine was probably a fan, not a casing problem then.