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I have not seen this model personally but it's chassis mounts vertically, correct? You should be able to remove the chassis being mounted to the front bezel and CRT as an assembly so you have exposure to the backside. If you have the Howard Sams, it should have some specified test points on some of those terminal strips.
As for the remote chassis, there may not be any schematic info for it. I have an older model Zenith than yours (Z3000 chassis 17Z23Q/ Howard Sams 343-18) with remote and no data is supplied or listed as a suppliment either. I'm sure it may exist in some Zenith book somewhere....
Those tube extenders are handy to have though!
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