Adcom GFP-750 Right Channel Issues

I'm working on an upgrade modification for this GFP-750 preamp. Once the cap portion of the upgrade was installed, I noticed I had no right channel when the unit was out of passive mode. I've checked components, traces, solder joints, and voltages. Some of the voltages are off on the right channel, but I can't figure out what is causing them to be off. Any help would be appreciated.