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What could a brown oily substance be that coming out of the Mic on the boom of a Soft Comm C-60. It is not working and no idea what it might be. Reception is excellent.

My grandson is starting to take flying lessons and asked if I would give him a headset. I have a Soft Comm set that looks new but I haven't used it in years. I took it out of a flight bag and the mic on the boom looked as if it is leaking a brown oily feeling substance. I took it out and...