Bluno M3 as standalone controller

Dears,

I want to use the Bluno M3 (V2.2) as a standalone controller. Means, I will get rid of the Arduino firmware and use it purely as a STM32F103 micro controller board.
For this I want to know the connection information between the uC's port pins and the Arduino ports. Is this information available, or can I find the schematic drawing of this board somewhere on this site?

Thanks for enlightening me
Stefan