Hi there.There is a strange trouble with my DK2S.While main switch is on and middle single pickup is working,a squeaky sound comes from that pickup.Moreover the more tone pot is tuned highly,the more that sound somes.I'm very anxious now and don't know what I should do.I need any possible help and advice as soon as possible!

When was the last time you changed the battery for the sustainer?

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Chaos, panic, and disorder.. My work is done here.

It was 10-15 days before.The new one is still fresh.But I must add something.Tonight I cleaned my guitar's body with lcd screen solution.I did it before but did not see any trouble.May it is responsible for this problem?I suspect that a little drop caused the problem.

If anything got into the switch, it may have completed contact and ran your battery down until it dried.. If anything did get wet, it may very well have caused some other damage..

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Chaos, panic, and disorder.. My work is done here.

I checked my guitar this morning and noticed that the squeaky sound is almost gone.The first possibility you say is more likely to be happened and it looks like it dried.Thanks for your help .