HK Turnigy Fabrikator - Upper layers not solid

[PhilippG]

I think you have your hot bed and fan connected backwards. D9 is connected to the fans. D8 to the hotbed.

I have connected them the way you described it.

I even disconnected the cables and connected them to another 12V supply to see, if the labels were correct and if there might be a shortcut anywhere.

The mechanical connection is right.

I even flashed the firmware you uploaded to the printer, but still the same issue.

UPDATE:
I completely disassembled the Control board to get to the Arduino Mega.

Digital Pins 8 and 9 seem to be shorted.
I tried with a custom sketch:
Both Pins Low: 0V
Both High: 5V
One Low, the other High: 2.5V

The measured resistance between D8 and D9 with the Arduino off is < 1Ohm.

I thing my Board is broken.... replacement is on it`s way...