another impact leak . sigh.

hello again, after a few months of "peace" my fx impact has developed another leak. troubleshooting the case i figured out that is from that tiny hole just left of the safety lever. reading around seems i have to change some orings on the regulator assembly. i ask advices to do so for the correct procedures, i've seen ernest videos about regulator but i cant figure out how to disassembly it in a safe and easy way, do i have to remove all the hammer spring etc? looking for any advices thanks.