OK, I now know what happened. The slat track retracts into a channel, called the "Can" that is a box section that is formed inside the fuel tank to allow the the slat track a place to retract to. It would appear that a bolt or nut was able to enter the "can" and as the slat retracted the slat just punched the bolt/nut throught the "can" into the fuel tank. The rest is history.
Matt
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