Peaking coils will only affect very short transients, near edges. Not the case here.
That streaking is a very long time constant, lasting for most of a scan line.
The important clues are:
- Injected composite video into circuit, just before the 1st Video Amp, and observed smearing, leading me to believe the defective component should be after that stage.
- Injected composite video into circuit, just before the 2nd Video Amp, and observed a reversed fainter image, but didn't notice smearing - not that there couldn't have been any, I just didn't see it, leading me to believe offending component to be before this stage.
Scratching my head a bit to identify a component with such a long time constant.
Wish they listed the inductance value of L10, but assuming it's OK, how about R57 220 ohm and C21, .001uf (screen bypass) or C24 and R61 (connect to the sync separator).