My back driver side door will not lock or Roll down the window

OK I bought my 2013 FORD FOCUS ST about four or five months ago car is great everything is great everything works just fine besides my back left door I’m not so sure if it has anything to do with the motherboard. I tried using a code finder on my car to see if there was an issue with it but nothing showed up and there is no error codes or anything. I can’t roll down the window nor can I walk but when I do lock my car from the outside all the doors were locked except for the back left but if you were to open the door the alarm will sound which is good still but it’s still not help the fact that somebody can easily just ignore the alarms they don’t give a $@$* and go steal my stuff that I do not want. I am partly mechanically inclined I know the basics like changing oil and breaks is there something I could try that may or may not work or maybe even reset the locks on the door in the power window I know how to reset power windows in general but whenever I did that they would reset and continue to work as properly auto rolling down and so on and so forth except for the back left and still did not reset when all the other windows reset. Also my middle lock button inside my car does not unlock the doors I tried looking up a reset on how to reset that but I could not find anything even on the focus ST help websites such as this one. If anyone knows of any little ways I could try and reset them on my own please help had this issue and has gotten it fixed and knows a way of getting it fixed involving a mechanic or yourself please send a message as well.