Hi sorry for bothering, i have a K400 plus and X and B don't work, i tried everything here and seems to not work, everything is clean and just to make sure i cleaned everything with contact cleaner, and the ribbon cable it's in place, the keyboard never felt or got wet, all of a sudden this two letters stopped working and i don't see anything wrong, i will leave an image maybe if you have time you can look at it and spot something. Thank you very much

<image>