Thanks for the reply guys. I don't think the resistor looks damaged other than the outer coating that is missing. Never seen a resistor quite like that, but if it will happily work, then it won't bother me to leave it as is. I haven't attempted to even plug this PS in yet and I don't know a thing about its history other than it has sat in the sweltering hot Texas heat in a garage for the last 25 years, so it may not work regardless.