Tivo network adapter burning or what?

I have a rack with four TiVo Series2 boxes. They are really old, two of them are like 11 years old, the other two are about 8 years old. I've just seen that looks like a sign of burn, or a short circuit, or I don't know what. It seems that the network adapters are melting, three of them. Maybe it's a high temperature? Am I at risk? Please help!:confused:

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