Introduction
It's a good idea to replace your thermal paste from time to time. Especially true for the Core i7 models.
Tools
Parts
- 
                  
                  - 
            Start by removing the battery using the 2 latches (red rectangles) 
- 
            All screws to be removed are marked with a D (green circles) 
- 
            The hard disk or ssd has a shared screw with the d-cover (backcover). Also remove the screw below. (blue circle) 
 
- 
            
- 
                  
                  - 
            To remove the dvd drive just press on the button marked with a red rectangle. 
- 
            It will then pop out and may be used to just pull out the drive. Easy as cake. 
 
- 
            
- 
                  
                  - 
            To finally open the device turn it by 180 degrees and pry open from the backside with a spudger. 
- 
            You will see that the d-cover is mounted to the other side. 
- 
            Remove the cover and turn the device back like seen in image no 3. 
 
- 
            
- 
                  
                  - 
            There are four screws with springs on them which have to be removed in the order embossed on the heatsink. (red circles) 
- 
            Also make sure to unplug the fan very carefully. (pink rectangle) 
- 
            Remove the heatsink by lifting it out to the left side as it is fixed on the right side. 
 
- 
            
- 
                  
                  - 
            Both the cpu DIE and the copper part of the heatsink should be cleaned as the thermal paste tends to dry out over time. 
- 
            Use a cotton swab with some rubbing alcohol. 
 
- 
            
- 
                  
                  - 
            Use thermal paste of your liking and apply a thin layer (I almost used too much). 
- 
            The thermal pad (red circle) should not be replaced with thermal paste. If it seems dried out you have to use one of the same size. 
- 
            Reattach the heatsink very carefully and tighten the screws in the given order. Also don't forget to connect the fan. 
 
- 
            
To reassemble your device, follow these instructions in reverse order.