Since I was working for Hankin's in Brisbane as a workshop tech when FJ was new, just want to say sounds like you have a driver board fault and not a power supply fault anymore, from memory and remember this is going back some 29 years ago we used to substitute TIP 122 with 2N6043 but you need to bend the legs and swap the base and the collector of the transistors. The bumpers should be solenoids 09, 10, 11 sorry I don't have any schematics anymore so this is just from memory.
Just look at the Solenoid - lamp driver board circuit and see which transistors correspond to the bumper solenoids as above, feel free to email me the diagrams if you have a scanner, I might be able to help you more.
Please cut the wires or unsolder them from all of the bumpers that are being pulled down on power on as said before hand by someone else.
And yes I feel for you red hot transistors do explode when being shorted.
