Some quick observations:
1. The .002 uF coupling caps in the second stage of the line amplifiers are still original. These are not easy items to replace, but are of the type that leak significant DC voltage, and invariably do.
2. The cathode bypass cap in the first stage of the Channel B line amplifier is still original as well. Again, not a particularly easy item to replace. The cap may still be good. They don't classically leak, but they do often go intermittent.
3. Some of the cathode bypass caps look to be of the non-polarized electrolytic type, but I can't tell for certain. Such a cap will work in the application, but are not designed to have a constant polarizing DC voltage placed across them, which is the case in the application at hand. You might want to look closer to see if these caps are non-polarized types, or of the polarized type specified.
4. The power supply can caps may be running cool, but are showing signs of pressurizing from internal heat. It may be heat absorbed from nearby heat producing elements, or internal. But the sealing tar appears to be being pushed out somewhat now, which is a sure sign that pressure has been building. Whenever they are replaced, be sure to install Screen Stability resistors at that time as well if not already done.
I hope this helps!
Dave