P8 Lite - Power button not working (not flex issue)

Yesterday i replace digitizer in my Huawei P8 Lite and at first it looked like it went smoothly but after reassembly power button didn’t work. At no point i had to “force” any part so I was quite sure I didn’t broke anything. Also I’m 100% sure it’s not power flex problem since i have another P8 at hand and i switched flexes and power button still didn’t work in broken P8 while other P8 had no problem with “broken” flex. I assume i f***ed somehow flex socket but i don’t know how to determine it. Any ideas what i can do with this problem?