Now that you have the unit on the bench changing all the psu electrolytics is not a bad idea as they are inexpensive. Sometimes an esr meter can also help in spotting the capacitors that are developing resistance.
Use 105 deg rated parts with long life.
Also I would try removing the regulator and first of all make sure you get the unregulated dc voltage coming into the regulator.
Make sure there are no burnt or corroded pcb traces, you might have to remove the pcb to look on the bottom
Use 105 deg rated parts with long life.
Also I would try removing the regulator and first of all make sure you get the unregulated dc voltage coming into the regulator.
Make sure there are no burnt or corroded pcb traces, you might have to remove the pcb to look on the bottom