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I hope you can read the above document. The long and short of it is that the document concerning the Modification to the MEP-803A is not to be sent, copied, used or disclosed by anyone not in the need to know group, of which we are part of. That's the bad news.
The good news, is all you need to do is remove the "foreign" wires, and reattach the normal wire harness, as I suspected. There is another mod, done to BOTH, (I think) electric fuel pumps. A thermostat was added to the auxiliary fuel pump, to keep it from burning up, should the auxiliary fuel tank go dry. Remember, this thing is supposed to be left someplace without supervision. The thermostat is attached to the electric fuel pump with epoxy, and hooked up to the electric fuel pump wire harness, P-21. If the pump runs without pumping fuel for a certain amount of time, and gets hot, the thermostat cuts the pump out of the system, to prevent overheating and eventual damage. In any case, its on the Aux pump. Check the main pump. Some were modified, some were not. While I think its a good idea in this application, I don't feel like its needed. Your decision.
As I also could not read the document, I suspect that this is about all you need. My friend told me its straight forward, just remove the wires and reattach the old ones. You CAN write Tobyhanna, and ask for permission to get and use the document. I can get the address if you want to do that. But I don't think its worth the time and effort, unless you want to keep the gen set modified.