Hi, The little strip of black plastic that covers and stops debris from entering the shift mechanism (shutter)fouled up and was removed. Now the retairers are rattling around and somtimes stops the shifer from going into park. I have to pry at it and somehow reposition the broken piece. I bought the "shutter" but dont know how to open the shifterblock to replace. I dont want to remove from floor because of linkage. Any secrets on breaking this module open without removal? At least I could remove broken retainer that is too big to fish out