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A neon lamp tester carefully held near the plate lead of the horiz output tube will tell if the horiz output stage is working at all (should light when held near the insulation of the lead) This is where I would start.
The goo I think is some kind of silicone or other sealant that has disintegrated and ran down the side of the CRT, I think it was originally applied around the HV connector. Have seen this on other similar Zenith sets.
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