Toshiba Regza 40in -screen has faint horizontal lines?

Im now unsure whether the problem i think i see is/was there before i dropped it at a service center or not, but its almost as if you can see faint, lightly noticeable horizontal lines. the way they appear i think perhaps its just me over focusing on my screen looking for problems. i may have gotten a lil paranoid after leaving it at a service center un-supervised. Any other regza owners perhaps notice the same thing? For example when u switch inputs and u see the current input selection on the top left of the screen ie: hdmi1 u can sort of notice little lines through the letters.