Lol!  My wife may have just made this solution real simple!  I was showing her the pics of how I spent my morning...  She made a halfway sarcastic comment about me fixing the shower wall panel when I put it back tgether (one of the plastic push-pins never seats right, so the panel pops loose all the time.)  Not a big deal, but not worth tearing it apart for no good reason so far....
Then it dawned on me:  The only thing holding the shower surround in place is a few of those push-pins and a couple beads of silicone at the top edges!  I *think* that if I pull the tub surround I may be able to see into that cavity behind it!  If I can, I should be able to see both the marker light and the taillight and make a working repair REAL simple!!  
If this works, my wife gets all the credit!!  (Hey, even a blind squirrel finds a nut once in a while, right?  :P)