I have machine error E04-14 on display

E04-14 is the Fuser IH Driver fan rotation.

Fan is disconnected, or defective, EC PWB connector CN510 is disconnected, or EC PWB is defective. If you have replaced the fuser recently on a PM call, you may have not seated the connector back in properly, or in some cases there may even be something caught in the fan itself. That is a very solid machine, so I would look for the obvious before I start looking to board problems.