17. Reattach the 2 small screws on the sides of the heatsink.
18. Return the blowers to their original positions and secure with their 6 screws.
19. Replace the sealing tape between the heatsink and blowers (if it's too damaged, electrical tape is fine).
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20. Reattach the case cover and secure with the 4 screws.
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20. Reattach the case cover and secure with the 4 screws. Start with the side opposite to where the screws are, it should be a tight fit, putting it in place it at an angle helps.