3.82 ohms is close enough to 3.9. I suspect Q101 and/or Q102 are blown. The model of those transistors should be in the parts list. It will be something like 2SC_____ or C______. Considering the issues you're having with this power supply, and the fact that at least some semiconductors appear to be lunched, I would probably replace Q101-Q105 and D101-D105. It's a small number of parts, and you'll know that they're all fresh and not subjected to any power spikes or other abuse.