Hi!
edit: merged with Conscriptvirus's post so it's easier to follow:
This modification is very dangerous, can lead to broken chips.
Don't say i didn't warned you...
edit: he's right, it is easy
Lenovo did a sloppy job with cooler, too much thermal paste, weak springs, overheating and throttling machines...
First of all, disassemble the machine.
Then do a repaste, with bare minimum amount of thermal paste, and remove cooler again, check thermal paste spread.
Remove screws from cooler,