I just opened up the MP Rodimus ..... arm is broken and there is no instructions for the figure, have you opened up this item before?
I have never opened it, I got it from TRU like that (I swear on all that is holy and my entire Transformers collection).
I personally had to return 4 of them (3 had a shoulder problem and 1 leg panel) to get a good one for me. There are threads on the forum regarding quality issues with Rodimus: