Should I repair my jailbroken device or not?

My 6.1.3 jailbroken iPhone 5's speakers do not work. The phone is still under warranty, so I can bring it into an Apple store to be fixed. However, I have to re-format my device to factory settings so my warranty is not voided. After Apple fixes the phone, can I downgrade to 6.1.3 to jailbreak again? Or is there another solution to this?

Your warranty is void, and restoring it will not delete all the jailbreak files.apple can tell and wort repair.

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