Unfortunately, I have no real way to test the electrolytic capacitors for leakage.
I do have testers, a cheapy Mega328 LCR-T4 Transistor Tester, 2 DVMs that test caps, and a more pricey LCR meter, and all tell me generally the same thing within 3%-5% of each other when I test caps with them.
The Mega328 is the only one that shows any kind of leakage reading at all, but being powered from a 9v battery I don't put much faith in it for a accurate leak test for 200v+ caps.
And granted, when I DID power up and run this set, it was on for over 40 min, and all the electrolytic capacitors cans were still cool to the touch, so I guess that is a good sign that the are OK, not leaky.
And unlike my CTC-16XL, which had all the resistors replaced on the chroma/luminance PCB
everything in this one is all original, so I got to check it all.