Volume Keys not working...
 

Hello my friends,
got a maybe tiny problem...

My "Volume -" Key stopped working some time ago (checked the old via multimeter, no reaction if pressed), so i ran to an shop nearly an bought a new key (Original!).
soldered the new button, and what happens? "Volume -" works without problems, but as if by magic suddenly the "Volume +" did not do anything... first time i could live with that, but now the "volume -" seems to die again... I searched the "N900 Schematics", and on page 7 i found the keys.
Heres the schematics: http://mohammadag.xceleo.org/public/...Schematics.pdf

Now my question, how should i solder the keys now? one of the contacts is now 0.01x0.01mm small, so it is impossible to solder the key there again (my fault :( )

For me it seems it is possible to solder the keys to Input9 (E1) of z4302 and the other side to Input2/3 (E2/C1)
Am i correct or is there something wrong with this idea?

Thank you

Russe