James,
Do what David T. said about ripple. That will tell a lot. David may have found your problem or part of the problem. If you have the original filters in, it would be best to put in new. Make SURE to jumper pads the originals had as a trace. The negative lugs were used instead of traces. Before you replace the caps, measure the voltages from ground to the output of the rectifiers on the + supplies. The negative supplies will need to be across each filter can for each supply.
Trace the voltages from the supplies in the power supply to see where they drop too low. I know you have low/no B+ on the outputs. A short in the rest of the circuit sounds the likely culprit. Any lifting of the supplies to eliminate a section will be best. You could have one or both bad MC1458 opamps. Some of the resistors in the power supply are too small in wattage (R1726 to 2W, R1722 to 1 or 2W, R1718 to 2W (a 68,000 ohm 1% will work), R1727 to 2W, R1733 to 1W). Sometimes a resistor is out of tolerance or open causing problems that can appear to be elsewhere.
C1737 could be leaky causing the 65V to be low. That one I said can be a higher capacitance, e.g. 10-33mfd.
If you have removed any of the screws that the series pass transistors are secured to a grounded heatsink, check to see of the insulating pad is still there and no short from C to ground. Shorting one of the collectors to ground will throw you supply voltages way off.
Read and do what the other posters said. They gave excellent advice.
Mark
