I got the bad one apart without destroying it...
Sure enough there is a little 5mm square heat sink mounted resistive or inductive etched cicuit board that has 2 leads from the main board attached to it.....one of the bare wires was detached holding a broken off piece of the etched board....the other wire was attached to the 5mm etched demon....but the whole little board had become detached from the small heat sink....and there were dark spots on board like it had overheated somewhat....the little etched board measures about 7000 ohms lead to lead on another module out of the circuit....will try to remvove board from scrap module and install on the one I need......what a drag.....these are too delicate to live in an engine bay here in the south.....

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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)