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Strange keyboard problem

I dropped my laptop (case was closed) today. Later certain adjacent letters started not working sporadically: 8 i k ,

Notice that they are vertically adjacent on the keyboard. Occasionally, they won`t work at all. Most often they work only when  press the letter to the right or left immediately before, e.g.: jk or ui

Should  try disassembling and cleaning the keyboard? Or is there some diagnosis you would recommend first? 

 This is a Dell Latitude E6410 laptop. I got it as a refurbished computer, and it has been very reliable. 

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