Zenith no snow, no recieve

[6GH8cowboy]

Trying to get a Zenith 16Z25 going for a fellow collector.
Tubes check good, detector diode test good. If's don't pass noise when probed, tuner osc is working per scope near proper freq 3 or 4. AGC makes no difference if adjusted. AGC at tuner is -1 volt and forcing + or - with a few external volts makes no difference.
The only schematic I could find is very blurry and I cant read values or volts.
Someone's been in there before me and that shakes my confidence in what I have before me.

Does anyone have tips to isolate? I feel I should be able to get snow but there is a IF, Tuner, AGC issue. What would be the if freq? I could try to inject a small signal and see if we are good there.

IDEAS?