I read a post about replacing the controls on a FP3/4NC and noted comments about difficulty replacing the bosh servo amps. Ive been researching this and found it shouldnt be a problem. These servos are brush/tach motors and the spec plate shows 165v ~11 amps. I found a couple of different manufactures that have off the shelf amps for under $400/axis. Im looking into this because my bosh amp is squeeling quite a bit so Im a little worried about how long its will last. I wondered if anyone else has actually replace the bosh unit yet?