Import .GPK or Modify Complex element

I have a small chain I'm working with in the .dgn file.  The chain got slightly modified and I can't undo back to the original chain.  I recently uploaded the chain to the .GPK but when I try to pull it back out of the .GPK I get an "unhandled exception error." 

I have been trying to add the deleted piece of the chain back manually but can't seem to insert it where it needs to be.  Is there a better/different way to insert a curve into the middle of a chain?