I've removed the resistor that got hot and checked it for resistance.
It didn't get hot enough to open up but it is a bit lower than 470 Ohms.
Even though this type or resistor has at least a 20 percent tolerance, I'll
replace it with a new one since it is at least 50 years old.
The new one is a 2 Watt Metal Oxide type, smaller than the old one
and closer to the value on the schematic.
With the replacement resistor in place, I'll finish the repair of the power supply.