To drop targets 1 and 2, the extra diode is needed because those 2 targets (and only those 2) are on the solenoid expanded circuit. Without the extra diode, it would activate other solenoids when fired. Good thing those 2 work because the expanded solenoids are harder to diagnose and fix.

Since all 5 do not work, there's bound to be a break in the solenoid supply daisy chained wire would be my first line of diagnosis.

Start with what sulli10 says.