Hi, I have a DX c401 that gives intermittant e7-11 ! I see its a with lamp unit and shading ! I cleaned all and did a shading adjustment, it goes away for quite awhile after turning on and off but eventually codes again. Would I have to replace whole scanner assembly or just lamp assembly, Also tis is a DX C401 i am not sure if the MX c401 uses same scanner parts , any thoughts appreciated. Jim