If you replaced the paper feed assembly and the jam occurs from both trays 2 and 3, the other item might be the sensor that tells the printer the paper has reached the feed assembly. The more I think about it I really doubt it is that sensor or flag since the paper would advance beyond the feed assembly and trip a jam message when it reaches the registration flag. Have you observed from the rear of the printer to see if the rollers turn at all. If they do not, then the issue could be ecu.
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