Zenith no snow, no recieve

[6GH8cowboy]

No noise while changing. also no noise when probing any of the IF's. Gut keeps telling me IF's. IF volts look good and G1 bias should be in into conduction. Played with AGC w/ external P.S. but no improvement. Still pondering, Detector diode checks good but maybe I'll sub it out.
A sharp schematic would be helpful, the owner may need to get one.