The Service Manual can be [link|https://dl.dell.com/topicspdf/alienware-m17-r2-laptop_service-manual_en-us.pdf|located at Dell's official Support site|new_window=true]. There is an entire second on how to remove the Heat Sink and(as well as any parts needed to get to the Heat sink). It isn't as linear as an iFixit Guide, but you should be able to muddle through.
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You may also find the [link|https://www.ifixit.com/Guide/How+to+Repaste+a+Laptop/158549|iFixit Guide for repasting a laptop CPU] helpful.
The Service Manual can be [link|https://dl.dell.com/topicspdf/alienware-m17-r2-laptop_service-manual_en-us.pdf|located at Dell's official Support site|new_window=true]. There is an entire second on how to remove the Heat Sink and(as well as any parts needed to get to the Heat sink). It isn't as linear as an iFixit Guide, but you should be able to muddle through.