Its an awfully simple gun to work on for basic maintenance...replacing pins, springs, rods, etc. The Inertia Lock is a hand fit, proprietary fixture. But if its a maintenance issue, you can probably do most, if not all, of it yourself with a few pointers. For major issues, the recommendations above are good ones, and the company itself is also excellent.
If I were you and needed factory-type service, I'd contact Craig Richardson @ Ljutic...tell him about your prior experience. In view of Ljutic's recent new lease on life (new ownership), I'll bet you that you'll see much improved service this time.