The flybacks on the 15 inchers don't seem to be terribly failure prone. I would reinstall the jug at this point and try to get HV, horizontal deflection, vertical deflection, even in a brief test, and a quick check of the convergence circuitry and CRT itself before going any further. My 2 cents...
There's little sense in continued restoration efforts if critical parts are dead. I don't like the test results of the 15GP22 at all...
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