Fujitsu lifebook j not working

[nickyyy]

I have a fujitsu Lifebook, i have not done anything like moisture or somthing like that, the problem is when I put on my laptop,the j key stuck and when laptop is in windows it start typing jjjjjjjjjjjjj......... when i usually press the k key once...it stopped typing j...but then j is not working... what should I do ...please help

 

[WR2]

Clean the keyboard? Especially the J key.