I have a Lenovo Yoga 720-13ikb, I’ve been using it for 3-4 years now. My laptop fans have started to make some noise when they spin up, it is a continuous noise. What will I have to do to manage this issue, do I replace the fans(I’m not sure if they are a part of the heat sink assembly or a separate module) or would cleaning them out solve the issue(if so how do I clean the fans).