Zenith 19" Chromacolor II service suggestions

[Kevin Kuehn]

Someone gave me a 19" 1978 model K1924W with chassis 19KC50. They said it didn't work, but when I powered it on it's basically working, but with a very washed out picture and retrace lines. With no signal it has a very bright raster so I've concluded the CRT is in good shape. At this point I have not replaced a single component. I'm thinking AGC but I don't currently have a service manual. I'm wondering what the difference is between Zenith service CM-107 and CM-107S1? 19KC50 is listed on the cover of both service manuals. More than likely a few electrolytic capacitors need replacing. Any suggestions from those that have worked on these would be greatly appreciated.

[edit] Forgot to mention the sound is crystal clear so that probably rules out AGC.