I didn't have the crossmember problem but I had the "oil canning" problem that was in a TSB. And they had to "dimple" the fender NEXT to the battery, not under it.
Try this, open your hood and grab the top of the left front fender with both hands. Push forward and backwards like you are trying to rock the truck from side to side. If you hear (and feel it) it's probably still the fender.
They did mine once and I had to go back and I worked with the service tech and we both dimpled it until it quit. There is a hole on the outer fender and a hole inside next to the battery in the inner fender. Inside those holes is where you "dimple."
Hope this helps.
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