port plugs

I recently noticed some discoloration on a couple of my Atomic M1 regulator port plugs. Could this be corrosion? Are the plugs still safe to use with the regulators? Both plugs were stored in a dry bag, but they may have been exposed to humidity since I often reached in with wet hands. I...

Just bought my first set of reg. I've connected all hoses to their appropriate places. I have 1 unused HP port and 2 LP ports. Do I keep the port plugs in those holes or remove them? Yes, I read the manual but it doesn't stipulate. I'm guessing I keep them in, otherwise the air will leak when...