letter lower case a sticking on Swedish K800 Keyboard

The letter a on this K800 on boot up of the computer stays on eg aaaaaaaaaaaaaaaaaaaaa etc no other letter

until another character is keyed in eg an S so you get aaaaaaaaaaaaaaaaaas and then the letter a wont work till the keyboard is switched off then back on and you get the letter a...aa again.

I have taken the A cap off the keyboard and cleaned around underneath but its still stuck so suppose the microswitch/ contact/ logic gate is permenantly closed. Without a disassembly protocol/circuit diagrame or spare parts available can this be fixed?

!!!!!!!!!!!!!!! I should add that using another standard MS keyboard all characters work properly but no access to Swedish spcial ones !!!!!!!!!!!