Did you check for blown fuses on the boards in the backbox?First step is to check fuses pull them out and test with meter.
Testing diodes on coils you have to remove one leg of diode to get a correct reading.Coils very seldom every go bad unless they are fried/burnt,coil transistors do go bad or shorted
Very Long post much easier if listed like this
Problem 1.
Problem 2.
Ect.