Need Instructions on How to Open RT-AC68 Case

I have two RT-AC68 routers, one I purchased new more than 6 months ago and one I just purchased refurbished. The RT-AC68 I purchased new has always run hot (IMO) with a CPU temp at idle of 86 C. and temps under load exceeding 92 C. 2.4GHZ and 5GHz radio temps run 56 - 61 C. at the settings I use (110/120mW settings with Johns Fork ver 374.43_2-13E1). I do not overclock or run high power on my routers since reliability is my number one priority.

The second RT-AC68 that I just...

Need Instructions on How to Open RT-AC68 Case