Suggest you contact user John Roncallo. He learned a lot about the M120 by successfully stuffing one into a 107 body.
From the looks of your printout, there seems to be something drastically wrong on one side, a voltage source, a control unit, sensors, or something even more exotic. But don't take my word for anything. I'm trying to keep a '75 450SL going after many years of neglect.
Best of luck.
Scott