You really need to go through Power Gears troubleshooting guide, a few pages to find the problem. There’s numerous reasons the leg could stop at 3” on the way up. For instance, mine has a magnet on the bottom and the top of the leg to let the system know when the leg is either all the way up or all the way down in order to stop the motor. The magnet (about the size of a dime) came off of one my legs at the bottom, so when the leg retracted it went all the way up and the motor kept trying to pull more, overloading, tripping the system. Since the legs are retracted in a certain order, once the troubled leg tripped the system, the other legs were in random places making it hard to trouble shoot. I’ve also had motor brakes that locked up causing the same type issue you’ve described. In other words, it isn’t just, “Oh, your problem is definitely this” or “that”. Many things it could be, sorry.
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