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You may be onto something.
Try putting an AM radio in proximity to areas of suspected arcing.
Arcing of anything will usually cause a loss of horizontal sync.
The next thing to look at for your sync issue requires an oscilloscope so you can see if sync pulses are making it from the video amp through the sync sep 6EB8 and amp tube 5U8 to the 6CG7. The K-dots all over the place show the resistors and capacitors in the Kluster-packs (AKA integrators) and any one of those could cause your issue. Check those tube voltages....
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"When resistors increase in value, they're worthless"
-Dave G
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