also p24 turns to p24g on one of the poles. that 3 pole switch has caused alot of prolems for elevator guys. turn off the switch, to check something, and when you turn it back on, you have more problems then when you started. the administrators problem turned out to be the door board. I have a similiar problem on a dmc, if you turn off the mainline, and turn back on, the car will run fine but not open the doors, you have to get to the door board and press the reset button, the all is fine. still need to change that door board. strange problem, you would think cycling the power would reset the door, but it does not, it will only come back on line with a push of the reset switch.