Or just tell him that you're going to hire an electrician to fix it and forward him the bill. Phrase it like 'look, I'm saving you the trouble of finding a guy and taking the time, but this is a serious problem and I'm not paying for it.'

Get everything in documentation and get the professional opinion of the electrician in writing, too, to document that the cabinet was charged when he arrived. Just in case. Face it, Americans might be obsessed with litigation but at the very least you want to be protected if HE doesn't want to pay.