Hola Duane...check the 15M resistors at the end of the voltage multiplier. Just follow the red cable that it is connected to the power supply P.C. Board. Usually it is an open resisitor. (5 15M resistors Brn,Grn,Blu). If not, measure the voltage at the seconday transformer prior the voltage multiplier...should be around 90 V...Also, to find a faulty power supply, swap it from the good speaker to the bad and listen. Be careful to discharge the panel prior you do this, because it is not nice to get a shock (lol). Happy listening,
Roberto.