The previous owner spilled water onto the keyboard. Most of the keys on the keyboard had bubbles on them and the power button and the enter button were not working. Also the battery wasn't working anymore.
The repair went very well. I took the time for it. The job was finished in about 3,5 hours. Had to remove the logic board another time because i left the left speaker cable underneath it.
Just take your time to disassemble the machine. After the fix it's working really nice again.