Mutant rebuild needed

I’ve got an issue with a .22 mutant standard where the air leaks out until around 95bar. It appears to be leaking inside the breech block somewhere. I’ve changed the big seals on the outside of regulator and it did t make a difference. It seems like it needs new seals and I’ve texted talontunes a few times requesting a for a quote for a rebuild, but I’ve not gotten and response. I could try it myself but not sure If there is an O’ring kit I could use.?