I have a huge problem. I'm shown that the fan 90b is not working properly (I have a Pavilion 15 notebook) and I would have screwed on the housing and checked the cable or cleaned the laptop even though it is only 2 months old. Will the guarantee expire if I just unscrew the housing?
Yes, unfortunately
No. This does not invalidate the guarantee - you can also upgrade your notebook (SSD) and you have to clean the cooling from time to time… The grant is retained
Depends on the guarantee conditions.
Another question is whether they would notice it at all.
I had something similar at Acer, it was fixed without any problems.