Looks like it's time for a new keyboard.  Fairly common occurrence on notebooks.

Hi

 

Thanks! did a bit more searching last night and found out that cleaning it was the answer!

 

for anybody else having this problem, check the 'install' keyboard documentation in the manual. really easy procedure to remove the keyboard and dust underneath.  I got rid of all the bits - and wiped the back of the keyboard itself and now working perfectly!

 

K

... and i didn't have to remove the connectors either.