Rooted lg g2 issues and questions

A

AC Question

i hope someone experienced in this can answer my question..

i have a rooted lg g2 to play around with, but i have a hardware issue. the digitizer or touchscreen mechanism has a dead spot on the top quarter of the screen, i want a replacement. normally this wouldnt be an issue, but my phone IS rooted...

since the root is running fine and i literally did nothing with it, would they notice? the only thing that would give it away is the super user app and the fact that i changed my start up screen prompt. any way to change it back to stock?

i am not to computer savvy and the way you have to flash the stock firmware is way over my head.

any and all help is appreciated!