Help with replacement device

[zbushart]

Okay. So the 3.5mm audio jack suddenly stopped working on my sgs3. I called and asked for a replacement and it's supposed to come soon. So I took my phone apart and saw that the headphone jack can be easily replaced. So my question is shod I swap parts and sent the replacement device back and keep my new device with new part or will Verizon charge me????? Help would be appreciated thanks