OK here is some things to check/test:
Does the MAGjack Yellow led come on and the green one blink/flicker when you send data?
Do you have any DMX equipment you can test to make sure the Ether Dongle is transmitting to the Hub (I am presuming it is a active hub)
The PIC shouldn't get hot, the regulators yes PIC no...
You said this was from the First coop, if you mean the very first Etd coop then hold your Etd up to the light and check the traces for the PIC, only one should have a bridge.
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LoginDON'T try touching up your PIC your self unless you have SMD soldering experience.... Trust me on this one!