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#11
In my opinion, good thermal paste never needs to be replaced.
Try to find a Asus S530FA service manual.
Open the back cover. My Asus has tork screws so you may need small tork screwdriver.
Try to remove the fan over the heat sink without taking the heat sink from over the CPU.
You may find that the heat sink is totally clogged with dust. I used a vacuum cleaner on the heat sink. If you apply the vacuum cleaner or compressed air on the fan, don't let it spin. The fan is delicate. Block it or it can over speed.