Repair - Service Centre

Hey guys my S6 Edge has developed a few dead pixels and has had the ripple behind the screen almost as if something is pushing up behind it?

My phone is rooted/Custom Rom'd and I'm due to take this to a Service Centre on Saturday will this cause an issue for a screen replacement in the UK??

As dead pixels aren't related to root/rom.

Will i need to reset this back to stock before I take it into them?

Any service centre in UK than can unbrick a hard-bricked (bootloader) Galaxy A5 ??

I'm pretty sure I hard-bricked my Galaxy A5 - A500FU (same as here).

Is there any service centre in UK that can unbrick a hard-bricked Galaxy A5?

Thanks.