If you can, restore a nand backup and format the device.Better to get rid of as much tampering you can before sending it away,just in case they look.
If they ask you how the rail broke,just play dumb. They might put 2 and 2 together and think (hey,this guy was messing with pins,lets check what he did on the console),so the less you have on there,the better for you
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And how did the kid get the sx pro in the first place? f you can buy a SX pro, you can exchange that cheap part.
Acquiring an SX pro and replacing a rail isn't on the same level bud.
Plug and play versus opening a device and making it worse.Lets not forget that his impatience is what got him here in the first place.What if he strips a screw? breaks a ribbon?
As it is now,at least he might get a fully functional switch back that isn't messed up and still under warranty for any future mishaps.
If they send it back saying they wont fix it,then he can look at options to replace it himself