Looking for Zenith porthole schematics

[zenith porthole]

Hi,
I picked up this set when a friend went through a divorce a couple of years ago. I would like to get it working, and wanted to know if anyone had schematics for it. The chassis number is 24G26Z1, and the model number on the cabinet is 2438RZ1. At some point someone toyed with it, leaving several wires running from the upper to lower chassis disconected.

In photos of other Zeniths of this vintage, there seems to be a small circle at the top of the trim surrounding the screen, which my set does not have. Was this some sort of indicator light? I was also wondering how many of these sets are still around, and if they have any value.

Thanks for your time.