Dell Color Laser 3110cn

I have a Dell Laser Printer 3110cn. appear on the expression all 7.6 cm light magenta, black and cyan horizontal line. the line can not be obliterated, was thus with fixed. hate someone an idea what I might do or which part needs to be replaced. the consumables are 40% cyan, 80% magenta, 80% yellow, 40% black, 60% Fuser, Belt Unit 40%.

Does anyone have an idea which part might be defective? my guess is the fuser.

i am grateful for any information.