I'm fixing an old Makita 9527 that turns on and off intermittently based on the angle it's held at, and recently has stopped working altogether. I thought it was the wire where it comes into the unit, but I replaced that section and it's still dead. I've also replaced the terminal block, which I get about 8 volts across, and the main power inside the unit reads 100 volts (110V model). Everything else inside the unit looks fine. I'm stumped as to what would cause such a weird intermittent failure. Any ideas before I start bodging parts?