What do you mean with OG?Here's an internal shot of what the OG from the manufacturer should look like.
Does that mean that there is a voltage difference of 13V between 2 chassis ground points? This would mean bad contacts and a safety issue.Well I’m getting 121 out of the wall or from hot to ground on the iec but from the iec hot to Star ground point I get 108
(Regarding amp voltages only the voltage across the PT primary matters.)
Please do resolder the horrible lug connections on the IEC receptacle (also a safety issue).