Myself, I would probably fix it myself, don't know yet how, because I'm not sure what's going on. But I've had dozens of Smiths apart for cleaning, parts exchange, and minor repair. If you haven't, I strongly recommend finding a good gunsmith, simply because it's loaded.

If you have some experience with disassembling Smiths, you might post this in the gunsmithing section. Just remember that during every single step of the operation, you have to have that thing pointed where you'll get over it if it discharges.

P.S. Obviously, check first as Mac suggests.