DE m56a one barrel jammed?

I have a DEm56a, i love it, but i haven't had it too long, and don't really use it much... but one of the barrels is now jammed or something. I have unjammed the other barrels but this one is something special. no matter what I cant get whatever is in it out. The unjamming rod that it came with isn't strong enough to do anything. this made me resort to try to use a straightened coat hanger to get in there and try to unjam it. I tried to go in through the spot where the mag-shell loads in... Can't get the barrel clear.

also sometimes the cocking mechanism gets stuck and I cannot cock it. and sometimes it guts stuck cocking, it will cock and will move back and forth but it will not return to the full upright position and fire without some fidgeting

is there something else it could be? how do you take it apart? what can I do to make this gun sweet again?

thanks