We actually did that on this one. Took 24 v from board to valve, fired gv and ran without issue. Allowed us to rule out any issue w gas valve. First time I have done this, it also allowed us to run furnace long enough to trip roll out for good, leading to the root issue.
How exactly? You cycled normally and added another 24v to the GV, in addition to the 24v it might already be getting?
Or did you remove the existing wires from the GV? If so, how was the circuit completed?