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59.4 error is usually a faulty fuser or faulty dc controller. manual suggests replacing the fuser first. you can search for the fuser online and probably get it for less than at HP, the part # is RG5-7602-070CN
the part # for the dc controller isRG5-7647-030CN. if you are able to repair this yourself - great! but i might suggest a certified hp tech and make sure they guarantee their repair.