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It's hotswappable, so you can try removing the switch (presumably it came with a switch puller; this is NOT the same as the keycaps that you already took off, if i am reading your post right) and seeing if it has bent pins/swapping it with a different key's switch.  
There's also probably some AKKO software that will allow you to remap which key does what if all else fails.
Hello Friends, i bought my first MechanicalKeyboard on ebay (it is an Akko ACR59). Sadly, the Key for the Questionmark aint working. I unpinned the key and pushed the button under the regular key (on the board, if you know what i mean), but it just aint working. 
What can i do now. I dont find an option in windows to say that another button should do the questionmark. 
Can someone help.