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Use Z4root to obtain temporary root. Then again z4root to unroot. (Unrooting deletes the busybox binary, the su binary and the superuser.apk app from /system/app.
Don't panic, be patient - try again. If it stays at "running exploit" for more than 5 mins, stop it and start again. Make sure phone is not connected to USB cable and USB debugging is enabled in settings.
Superuser.apk gets installed in /system/app, which for normal users is a read-only directory. Having custom files in /system/apk is a 100% evidence phone has been rooted. VZ tech's know this very well. Returning it with this on the phone is like being caught by police with a smoking gun on the crime scene