look for an output coupling cap, if there is one (it will be almost as honking big as the power filter cap, and there will be one per channel), then a 10 meg DMM will give you strange and frightening DC offset readings that will "disappear" with a speaker load. It's the electronic leakage current that's unavoidable through a capacitor. The DMM is sensitive enough to detect it. But there isn't enough of it to disturb a speaker, no less start a fire. (unless of course the capacitor shorts out - then ouch, THAT's what fuses are for)
If there IS NO output cap (I don't have a handy dandy model list for that right now) a load resistor is not needed to set DC OFFSET, the dc offset will be the same with it or not. The Idle current may have a slight difference with a load resistor in place as now there is some place for the current to sneak off to rather then go through BOTH push pull output transistors.