i didnt have a heat gun so poped the mobo in the oven on a tray, gas mark 6 10mins, left to cool, pasted up the heatsinks and poped back together and blam it worked
ps. ive fixed it 3 times and i still use 8months on, if u try it make sure the brown corners of the mobo are the only things touching the metal tray and 10mins EXACTLY.
peace