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That's a new one on me.
To help localize the problem, ask him to reverse the yoke horizontal wires, and see if the pattern on the CRT switches left to right. If it does that will eliminate the yoke and CRT as the source of the problem.
I'd like to see the waveform of the current through the yoke on a scope but that might be difficult or risk damaging the scope if care isn't taken. It depends on the circuit. Can that section of the schematic be posted?
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