As for the horizontal issues, if you have not already done so, make sure there are no out of tolerance resistors in the circuit, having no VDRs in this set in the sweep area makes it prone to out of tol parts and aging more than the later sets.
Also, since parts were replaced, it's critical to go through the steps shown in the SAMS under Horizontal Sweep Circuit adjustments, this will get things most stable and lower the risk of frying the flyback.
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