Leif,
You may not feel it worth bothering, but if you do perhaps a multimeter circuit check. Also run the cable through your fingers. If you feel a bump then the odds are one of the wires has broken inside. Cannot remember when or what it related to, but sometime in my past I have come across this. In that case the wire was not suited to constant flexing.If so, you may be able to make a shortened lead version.
As there are 3 leads inside, it sounds like I will not be able to do anything about a mod of my MR-3 as that only has 2 pins.
Don
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