Gt-15 stopped working suddenly this spring. Took the back cap off, took the start capacitor off and it basically fell apart. Replaced capacitor but still nothing. No sounds. no humming, nothing. Power is getting to the pump. I can easily turn the shaft freely with my fingers. So I took it to a pump repair place and they say it needs to be replaced. Says the impeller melted ,most likely from running dry. (I guess it could've happened. It's been in service for almost 4 yrs and never had a problem before.) That said, if the impeller was melted to the diffuser (his words) would I be able to turn the shaft? I assume they checked the electrical on the pump before concluding that it was the impeller. Replacing those (2) items would cost around $60 as opposed to a new pump.