[Shane826]

It’s really not readily accessible, it’s all part of the vacuum bonded floor panel. I’ve had to do repairs where I cut the floor aluminum skin with a Dremel cut off wheel and dug out the foam. Your best bet is gonna be to cut the interior wall aluminum skin, dig out a small pocket, drill up through the existing hole, then run a bolt up through the floor and put a nut & washer inside the wall pocket to tighten the bolt. Do this for each screw that’s backed out. Fill with expanding foam, trim the dried foam, and cover with a piece of aluminum or something along those lines. This should all be inside the cabinet so it won’t be visible but it’ll be tight quarters.

Now if you pull the hardware out and they are BOLTS, then there should be a threaded T-nut in the wood framing. Clean up the rusted bolt, jack the bracket into place against the floor, red Loctite on the end of the bolt threads, and you should be able to re-fasten it in place.

As for the aluminum framing, that’s for the upper frames. But even they still have wood framing on the open ends to this day. And the bottom box has always been, and still is, framed in wood.