My TV set (Zenith) just started displaying strange colors. The image is
still clear, except that, I see 3 vertical bands, one too much red, one
too
much green and one too much blue,

MY 16 yr old JVC went out something like that last month: pink and green
only. I took it to a shop that gave free estimates and he found it was the
'degaussing' circuitry. Fixed it the next day for $ 80 and its fine now.