Help please!

Overnight my nexus 6's USB port decided to die. Computers wont pick it up, it wont charge, AND my turbo charger makes a beeping sound while it is plugged in. tested w/ an old phone and it charges. i've tried different bricks and everything. still nothing. So i am trying to find out if there is some way i can unroot it, flash stock recovery and relock the bootloader without a computer because i cannot figure this out. i know i can do the super SU uninstall from supersu, but that will not fully unroot my phone correct? it will just remove root permissions. if i cant figure this out, i need to return the phone back to verizon and get another. but if i do so as is, i can say goodbye to my warranty... which i dont want to do. So if anyone can give me some help or steps in the right path, please do so. Thanks.
****Edit****
last night i went to bed and plugged it in and it charged just fine. i woke up in the middle of the night and heard a beeping. found out that my phone wasnt charging. and well. here i am now.