ctc-10 glitch

[frenchy]

I recapped etc. this set months ago and has always been working great. Tonight, for about 30 seconds after it had been on a minute or two, the picture broke into basically white horizontal bars which varied in number (similar to if the horizontal hold had been cranked all way over on a white screen). But I also lost the sound, just turned into a rising/dropping whine. When I changed channels nothing changed, same bars/whine. Then boink it came back to normal. Still working now.
Does this maybe sound like the tuning section since I lost ability to tune picture and sound? Could a tuner flaw cause bars like that? thanks!