We called Mr. Rooter because our water wasn't draining properly and a neighbor said that we needed a new grinder/sewage pump. We told them that we needed a 2 HP pump and they said ok but we had to pay half of the $2350 bill first. Unfortunately we were too trusting by paying the full bill instead. A guy came out with an industrial/commercial pump instead of residential. The plumber worked a full day trying to install it although it was obviously wrong because wiring was different. He finally gave up and called 3 other guys who came to help him for another few hrs. Finally the guy said he needed his supervisor to come because he was good with electronics. The next evening the supervisor came to tell us the store they bought it from had made the mistake but they could make it work with a $2500 control box! When he was told absolutely not he said there was nothing else they could do.
Sometimes a faucet leak can be stopped by replacing the rubber washer at the end of a faucet stem or cartridge. This is a more common repair on older fixtures when things were built to last and designed to be able to be maintained. Other times the whole stem or cartridge needs replacement or the bibb seat deeper back into the fixture needs replacement. That leads to matching up the right components and often times making a trip to the hardware store or plumbing supply house necessary due to the many varieties, makes and models of faucets. My advice is to make sure your Plumber has faucet repair kit on their truck before having them come out to assess the issue.