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.
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.