I'm working on a MX-6240N and when I do duplexing it will jam right at the ADU paper feed roller this is very intermittently. I can run single copies all day long . Looking at jam history I get a APPD1_N. This copier has 47865 b/w and 7362 colored on it so has not been used very much. Just looking for some help on were to look. All my sensors are working fine. It has a MX-RB12 and MX-FN19 on it. Thanks for your help
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