Pull the cooling/processing unit straight up to prevent damage to logic board

This will require some effort and should be done with caution to avoid damage.

The sleeves around the 6 screws may hold it in, if so just take a pair of needle nose pliers and gently squeeze the sleeves until it releases.

Pull the bottom, then side towards the bottom of the CPU case, first to move around the bottom coolant sleeve around the heat sinking bracket. *heat sinking bracket not in picture*