Fan was making horrible noise at times.
Repair was really simple. Basically remove the bottom plate to get inside the computer then removed 3 screws holding the fan in place. Used a plastic pry tool to gently disconnect the fan from connector and put the new one in, in a flash.
Just make sure you have a plastic pry tool. I've got one in a "mobile phone tool kit" from defunct RadioShack. They were also including in some iphone glass repair kits I've purchased in the past. I'm sure an electronics store would sell them in a "mobile phone took kit" as well.