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Well, I'm not there so please be patient.
If you've run water and after waiting a few minutes, you stick your nose in the sink drain and smell 'stinkies', you've got me stumped! P-traps and S-traps are designed to use water as a 'blocker' in preventing sewer gas from making its way into the bathroom. The only time I've seen this 'rule' broken is when the water in the trap has evaporated, especially after a long vacation.
So I'm gonna go out on a limb and say that the smell isn't coming from the sinks. Instead, it's possible that the wax ring has lost its seal on the toilet. If the wax is soft and got ****ed in a little by the power plumber, then you'll get a gas smell in the bathroom.
Also, you said you checked the vents on the roof. 'No obvious problems' is subjective. Did you use a flashlight to look inside the stack to see if a bird built a nest? Did you check the stack in the attic to see if there is any smell in there?
If there are other ideas on finding the source of your gas leak, I'll leave it to others. If, at some point, you finally fix the problem, PLEASE come back and tell us what you had done. It would be interesting to know.
My best to ya and hope this helps.
Jay J -Moderator
PS: God bless America!