convergence lines bent

[Eric_C3]

I have recently purchased a Mits Ws-55859 and have noticed that the convergence lines are a little bent for the 480i and 1080i signals. When i watch TV through the OTA (and the picture does not fill the display) i can see a bent edge.
The question is should i exercise my 30 day return? I have seen posts on adjusting the lines through the service menus but should i hassel with it?

Thanks in advance