Hi, soon I'll be trying to buy a new case fractal design meshify 2 and psu. I can't replace them myself. I've found someone at a shop who was kind enough to replace it for me (with insurance). Shall I ask to replace the 5 year old thermal paste of my I7 6700 with standard cooler too? The paste has never been changed before but temps won't go above 70 degrees C either. And this is in a case with bad airflow. So do I bother him with this? Or is this useless?