Packard Bell AGC issue

[miniman82]

Need to ask about this one, because I've never had an issue with AGC circuits before. This chassis seems to be pretty close to a CTC-9, the tube layout and most of the schematic match up aside from the AGC portion. It's still a 6AW8A triode section doing AGC amp duty, but the voltages are really screwy. According to the CTC-9 schematic I have here there should be +.8v on the plate, +96 on the grid and +138 on the cathode. Instead I have -104/+137/+147, with a portion of the negative plate voltage going through a resistor to form the RF AGC line. So the negative voltage is causing the tuner to be completely cut off, proven by connecting an external power supply to the AGC line: when I do that I get a picture, without it I get a blank raster. So obviously something is wrong with the AGC circuit, and I'm leaning towards to the abnormally high grid voltage. Can't nail it down though, because on the schematic I have the grid goes directly to the AGC pot which is grounded on one end, but on the actual chassis it goes to some other control's wiper.

Anyone have some random PB schematics laying around I could compare this to? Only number I see on the chassis says "149190", but that sounds more like a serial number than a model number to me. Any help is appreciated!