Questions according loudspeaker

Hey guys,

I've a question. After an attack of heavy rain some things stopped working on my one... One of those things is the loudspeaker. Now is my question is how I can check if it is my loudspeaker which is having trouble or has it to do with components in the circuit to the loudspeaker.

I've already opened my one, but unfortunately i damaged my battery with doing that...

Thanks in advance,
badeend1337