how to open the front panel of cougar mx310 ? because i wanted to add a fan but sadly i dont really know how to open it and i lost the manual. i tried brute forcing it but i realize i could break it , pushing it out with a stick still didn't work. pls help im trying to install new fans and i already bout the fans. installing the fans with the pros around my area are costly, 6 dollars a fan per installation 
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