Specific keys (5, 6, 8) work inconsistently on Y500

[enchained]

I'm talking about digits row, not numpad block.

 

Very often those keys either don't work, or print two characters at once. If I press again, they may work or not, or print two characters this time.

 

Anyone had this issue? I'm looking for those who have a design similar to Lenovo Y500. 

 

It started after a good few years of usage and became very annoying.

 

Is the keys structure just becoming old? Can I take those specific keys out and clean them, or it's too risky and I can break them in the process? Do I have to disassemble the whole laptop? Is the keyboard disassembled from the front or the back? I'm going to replace the wi-fi soon so I was thinking if I could do both.

 

I also heard about something like compressed air keyboard cleaner. Could it help with my case and my keyboard type, and do I use it on assembled or disassembled parts?

[TestKit]

I am having the same issue, would love to clear it up. I am going to repeatedly my y510p soon, so if detaching the keyboard helps I'll let you know