"Where can I find a bezel and back case for Kindle SY69JL 8th gen"に関する回答I would check ebay.com.
"Switches on or off."に関する回答Orange should be on for the switch to be on.
"phone getting hot while in use"に関する回答It might not be a problem, as I know a lot of older phones will get hot when in use for long periods of time. As long as it is not too hot to the point where it burns your hand to hold it, I wouldn’t worry about it.