It's always best to replace all 3 of those transistors at once. Otherwise you may chase your tail but eventually the merry go-round will stop, and it will work fine. I don't like revisiting problematic high voltage sections, so out with the bad and in with Great Plains good stuff. New filter cap, pot and whatever else looks or measures tired.
New! Dark mode!
Browsing Pinside at night? Getting tired of all the white? Switch to dark mode using the button in the top right (or CTRL-B)!