Power Scan 150 not striking...

Just jumping into fixing these things, but I figured the Power Scans, being older and simpler, might be a good place to start (like cars, right?)

Anyway, PS 150, struck inninially, but pops in and out. Sometimes work, sometimes not. Acts like a short or loose wire (like a bad instrument/speaker cable), but can't seem to pinpoint a wire causing it. Should I be looking at the wires? or could it be a problem elsewhere (ballast/igniter/capacitor...)
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