Reply to Buttons of my S4 broken

Hi,

Last week end, I brought my S4 for a gig, but noticed the next day that 2 buttons of the loop recorder didn't work anymore (probably spilled alcohol).

When I press these buttons, they stay down as if there was no spring any more ...

Would you have an idea to fix that ? Should I try to disassemble my S4 or it's too risky ? (I don't really use the loop recorder, but I'd prefer to keep my S4 intact !

Thanks !