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I'm not too familiar with that chassis; but, if the problem clears up after the set gets warm, you need to get a can of freeze spray and start hitting components with a cold blast. If you hit a component that causes the problem to come back; then, that part is likely to be bad.
If the set has A/V input jacks, try running a signal through the A/V input jacks to see how it performs. If it works OK through the jacks, that will isolate the problem to the tuner, IF, or AGC circuits.
From what you say, it sounds like a bad cap; but, finding the cap could be a chore. If you have an oscilloscope, it would be advisable to scope all power supply sources to make sure they are clean.
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