Hi HarrisonIII, yeah, tried that (R56), turned it full clockwise (viewed from outside of circuit board), no difference.

Do you know how it may be possible to ascertain if it is the Flyback? I've got a multimeter but don't know what's going on inside the Flyback or what to test for. I suspect I might be wasting my time going in for the major caps replacement program, my caps all look wholesome, no bulges, leaks or cracks.

Thanks for your time!