Hi all, just purchased above TV and noticed a dark cloudy spot on the top right. Quite noticeable on bright scenes. Could this be the backlight/diffuser/LEDs? Is there a chance this could be fixed easily? Purchased on Amazon, they are offering either a replacement/refund or will send someone to repair it, which would be the best option considering the size (don't really want to package it up and send it off, would be a logistical nightmare).