He is right it has to be clean but you can't do this yourself, you have to take this to the care center...
How Can You Fix Keys That Don't Work On A Laptop?
I spilled noddle soup on my moms laptop and not of the letter keys work what should. Do
Yeah ofcourse you can fix them. You simply need to buy replacement keys for these ones that are not working.I came across a company which sells individual replacement keys for all models of laptops. They have video tutorials on how to fix your keys too. And its very simple. Have a look: www.Laptopkey.com
You have to take the bottom off of it. You have probably spilt something in it and it needs to be cleaned.