Looking at the nexus 2nd generation (I assume that is what you mean by 2014 model) tear down guide shown in the link below you can see that the micro USB port is connected to the daughter board located at the bottom of the device. The only way to replace the USB port is to replace this board. There is no point trying to solder on a new port as it would be near impossible and you may also ruin the board unless you are really good at soldering and have the right equipment. You best bet is to try and find a cheap second hand daughter board for it if possible.
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