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Try disconnecting leads from the B+ supply branches at the filter caps till you find one that stops the arcing. Remove h.output tube & damper so you don't overload it if the oscillator gets disconnected. Check the voltages at the caps once you disconnect the B+ lead that stops the arcing.
Also...
It sounds like you have an intermittant somewhere if you had a period with no arcing...maybe there is a ground connection to the circuitboard that has come loose? I had a condition of no horizontal oscillator in a CTC-38 that I tracked down to a loose solder joint on the B+ supply to the osc. Check the joints on the chroma board for microcracks, check them with an ohmmeter/continuity checker, resolder any suspect connections.
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