First off, what is an IEC connector? I've got a place to plug in a network cable, and a headphone jack, on the back of my amp. I thought the power cord was hard connected, but maybe not, haven't moved it in a while. Anyways...
Potting compound, to guard against vibration? Is if soft, or hardened? I mean, can you wipe it off with your hands, or is it solidified so you can't. How about a link to a picture. If it's soft, sounds like heatsink compound for thermal dispersion, but that would seem funny. Maybe it's a moisture barrier....