Usually when both LED'S are high on the power supply board that indicates that the Power Supply Board is bad. I would start there. With all the I/O and Smart Boards pulled, you should have, 120vac from L1A to L2B, 17 to 27vdc from V+ to V- on the Power Board. 5vdc is measured across the 4000mfd on the Power Board.A bad Power Supply Board was most likely the original problem if both LED'S were high.