My Karcher K2 began to lose power and then it shut off completely and won't turn back on. I've taken it apart and tested the various parts of the circuit and switch etc is all fine except there is very high resistance across the motor. The carbon brushes look a bit worse for wear and the spinning part of the motor they brush against has two copper pieces of its cylinder blown off. There is also a scorch mark on the ridge of the metal bit that goes over the coils of wire (it's the metal bit that looks like its made out of new staples bunched together, if you know what I mean). Would it be worth me reattaching the copper bits that came off and replace some new carbon brushes or do you think the whole motor is kaput? Kind Regards, Matt