Vintage Simmons Drums (UK) Users Group

Anyone know how much it would cost & where to get an SDS9 module repaired in the Palm 
Springs California area? I just sold one to a guy there & he said when he got it & turned it on, 
there was a some kind of a squeal or hum that he couldn't get to go away. It worked fine 
when I shipped it, but we need to figure something out.

Thanks for any help,
Scott