That is a problem...I have a couple of good ones that I repaired by resoldering the large pads on the PCB...
The closest diagram I can find is a partial one in the Haynes 123 diesel manual....not much of a drawing but some info....very basic...no component ID's....
What is yours doing wrong...?
Are you sure it is the problem...?

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1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)