Never had a fuser cause a 49 error. As to testing if a bad document is the cause, just disconnect the printer from the computer or network so you only have power going to it. Turn it on. If it comes to ready, then the issue is a bad job try to print each time the printer is turned on. If you still get the error, then the issue can be a bad formatter and on this particular model it could be the cable between the formatter and modem is not sitting right.
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