Virus Ti Polar - Dead Keys

[ravecreator]

Hi, i´m new to this forum..
i have a problem with my Virus Ti Polar, i got 2 dead Keys on the Keyboard.
they seem to function ok, but give no tone anymore.

is there any chance to fix this myself? maybe i can open the virus
and try to clean the contacts? (i hope thats the problem)

how hard is it to open the virus polar and get to / remove the keys?
maybe someone can help or have pictures how to open a virus ti Polar?

many thanks in advance