@opengrace , fiskandar , Find below a 1st link for a tear down guide to show how to get into the device, to give access to change out the USB port. 2nd link is to a replacement USB which you can also do a search on for better pricing possibly. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
[guide|50576]
http://www.ebay.com/itm/Xiaomi-Mi-Pad-Charging-Port-Flex-Cable-/122026696235