Shredder cross cutting *faulty* (Loughton IG10)

Large shredder, worked well until one time I heard cracking noise while shredding 2 pieces of paper. I think a gear has broke and needs replacement but I'm not sure. It needs someone to open it and replace some part inside it, I would do it myself but don't have tools nor mind at the moment. Best of luck for whoever wants to try and fix it.