Evening, Patrick.
If you need a schematic of the headset and drop cord wiring to follow along with for the continuity checks, there is a very good one in Figure 12 on Page 135 of the Working Instructions Manual for the WS Cdn No. 19 Mark III.
Don't panic if any of your headset receivers, or microphone elements, turn out to be duds. They can still be found,
David
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