Engi3Piece
what exactly is broken, if you know where you can easily pinpoint what point to replace, is it a shoulder joint, arm joint hand joint, ect. if not the best bet is to just buy a new version and sell the broken one off of ebay for an extremely reduced price.
its the lower part of the arm you can take the lower part off to switch it for a diferent arm part and i might but i wanna see first if i can find a replacement.
http://myfigurecollection.net/picture/528923&ref=item%3A88082
http://myfigurecollection.net/picture/528921&ref=item%3A88082
http://myfigurecollection.net/picture/523238&ref=item%3A88082
That pic my help to show what i mean by the arm part