I just checked mine dude, no stress marks at all but to clarify, when you say "pins near shoulders" are you referring to the pins that hold the whole chest, head and arm assembly on?
I'll tell you what I did notice though, my Rodimus' ball joints that connect the legs to the figure have gotten fairly bloody loose and not because of overuse either.
Has anyone else found this with theirs? how are the new reissues/repaints on this issue?