Unfortunately, this is the way things are done. In a perfect world they would just replace the whole thing but from a business standpoint you can see where it makes sense; if they replaced every major part without investigating the issue first they'd go broke.
So one of two things will happen; they check it over and replace it, or they fix it. If the repair doesn't solve it, then make them do it again.
Unfortunately it's the only way that they'll learn to make it right the first time ...
"We are all born ignorant, but one must work hard to remain stupid." ~Benjamin Franklin
2012 Kona Blue Mustang GT
Roush Phase 2 625HP Supercharger | Black OTT Stripe | 400A | 5.0L | 6MT | 3.55 | HID | SP | CP | BBP | EP | RVC
Mods: Forget it .... too much to list!