My versant all the sudden started belt walking on the fuser. So I put a brand new fuser assembly into the machine and it did the same thing. The latches for the top cover are seated properly around the bearings. I did notice the lower pressure roller looks a little worn (has wrinkles in it). Could this be the cause? Any other ideas? It seems to last longer with card stock before throwing the error. When I run text weight it gets about 5 sheets and it has walked out of range. Any help is greatly appreciated.