If you are sending it to Samsung, make sure you never rooted it and if you did you ran triangle away to reset the flash counter and are completely stock on the official build or they will return it with out looking at it. If that is done then they may claim user damage and not repair but you may get lucky and the tech will replace the camera lens for you. Its hit or miss sometimes, but they will definitely claim the overheating issue is a rooting problem and you warranty is void even if root has nothing to do with it.
Phones & Tablets: Galaxy S4, Galaxy Note 8", Evo 4g LTE, Evo 3D, Acer Iconia A500, Samsung Galaxy Tab 2 10.1, Ipad 2, Nabi 2,
Rom: Rooted Stock for now, Hotspot Mod, Xposed, Wanum
Kernel: Stock for now