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I had a similar problem with my 2430DL only with one fairly prominent white line instead of two. I read troubleshooting tips in manual for this problem and first suggestion was to wipe laser lens clean with a soft cloth. I did this and no more white line! If you do not have your manual please email me and I can forward you PDF manual. email@example.com
This error (12H) pertains to the Laser Unit of the printer which is damaged and needs to be replaced. The Laser Unit is the heart of the printer, it's what transmits the image to be printed. You need to contact a service center and will run you about $200. I had this same problem with my printer and had to call Technical Support and they gave me the bad news