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BE4VER I don't think your diff is broken and I don't think it can be rebuilt, the shop's story seems a bit fishy to me but idk, it seems like they're angling to charge like $500-$600 and just replace the seals and bearings, if you get lucky they'll retorque all the suspension back there and identify anything else that could be called noisy and your car will be 'fixed' but idk. Like I said, I don't think a rebuild kit exists, at least not for the differential itself, it's whole differential unit (currently $1.5k new from the factory) or nothing meaningful is broken or will be changed. Lots of metal gunk is pretty normal for these things especially for the first change. Suspension gets noisy quick if there's anything not torqued properly after adding a bunch of stx parts.
http://www.ft86club.com/forums/showthread.php?t=124275
https://www.ft86club.com/forums/show...5&postcount=21
https://www.ft86club.com/forums/show...6&postcount=40
https://www.ft86club.com/forums/show...0&postcount=49
https://www.ft86club.com/forums/showthread.php?t=88048
I'd love to be proven wrong, but time and time again when it comes to fixing a worn out Torsen, the answer is throw it out, buy aftermarket or used with fewer miles.
Here's the exploded differential assembly and parts list, at a minimum I'd get a list of parts they plan on purchasing on your dime and make a judgement on whether or not it's fixing what you think it is.
https://www.subaruparts.com/auto-par...ber=4130153020