Diff fluid change turned into a bigger problem, need a specialist

[jacintocollier]

I took my Wrangler in for what I thought was a routine differential fluid change and the garage found metal shavings in the oil, which they said means the diff is on its way out. Now I'm looking at a much bigger job than I planned for, and I'm not sure whether to trust their diagnosis or get a second opinion. I'm in Musaffah so I've been looking into Expert Jeep differential repair in Musaffah, but I want to understand what metal in the fluid actually means. Does it always mean a rebuild, or can it sometimes be early wear that just needs monitoring? And is it worth getting a second opinion before committing to something expensive? I'd rather not rebuild a diff that doesn't need it, but I also don't want to ignore a warning sign.