If you're talking about the pinion bearing screws, I loosened the lock nut and the pins just a bit and put some non hardening gasket sealer on the threads. I haven't noticed a leak there since doing that, although I've only put 100 miles on it.
No worries about losing the gear pattern, unless your guy didn't get the bearing seated in the first place. That's not likely if two of the pins were tight. I would seal the threads, tighten the screws and move on.
