Well, I have been wondering for a while now if maybe the fan blades and air ducts in the laptop were getting a nice layer of dust on them. My scanner top is glossy and it needs dusted once a month. I have my fans running high when I am processing a lot of video work. I put 2 and 2 together and thought "Hey, lets take the laptop cover off and see if I can check for dirt, and if there is any, remove it"
I have watched many videos of peole taking their MacBook Pro's appart, read a few scare stories, and set about my way.
All screws removed, gently teasing the keyboard lid up...
Nah, It wasn't going to budge around the disc drive part.
I teased it a little harder...
My laptop then blew up and now I have no laptop!!
Just kidding. My sense got the better of me, and I clicked it all back down again and screwed it together.
One weird thing though, one of the little screws in where the battery sits (which you have to remove to take the laptop appart, not the memory plate screws) wouldn't go back in! It would physically sit in the hole, but turning the screw driver did nothing, so I ended up putting a miniscule ammount of Blue Tac on it to hold it in. Which worked.
I guess if there was any dust, there wouldn't be enough to increase the temperature that much.
I was going to stick the hoover on the vent grills to remove any loose dust, but am too scared of spinning the fans beyond their capacity and burning their motors out.
Best leave it be.
Anyway, cheers for replying to my post, I guess it's just one of those things that happens. To be honest, the third reboot after the update, my laptop temp stayed down under 50 degrees, then over a period of 4 hours, crept up to a constant 57 degrees.
I love my laptop so much, I am terrified of it going wrong, so when subtle changes like that happen, it alerts me.
Oh, and by the way, the laptop is out of warranty so I havent lost anything by attempting to undo the casing - which I wanted to try anyway, as I have planned to fit a faster bigger hard drive at some point.
Looks like an Apple Reseller will be getting some money nstead