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Maybe the arcing at the yoke when you were measuring pin 9 was a coincidence.
The yoke plug pin out and connection is shown on the schematic. The coil resistances also. Unplug the yoke to make the measurements. Make sure that the resistance between the horizontal and vertical coils is basically infinite.
From your picture it is hard to tell whether there is a strand out of place that is causing a short or close gap that may have arced, or maybe a wire has opened.
The filaments are fed AC, the rest of the tube pins should DC measurements.
The filament string voltages are shown in the lower left corner of the schematic but are seldom the problem.
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