Most, not all, 3-prong receptacles, showed correct using two different 3 light testers. Problem they were only wired with 12-2, no ground connection at receptacle. I opened one and it appears there is a ground clipped off at entrance. There are only 2 grounds at 1 of 2 panels, they are marked for AC. Most GFCI’s tested open ground as did a few rec.
Pics are of each panel and rec. in question.