OK, We have a 1987 version MPH1 that if the car runs for 13 seconds we get a DS10 that stops the car in flight returns to bottom landing opens the doors and takes itself out of service till a manual reset. A year ago we had the same problem and replaced the NSP (noise suppression board)and the problem went away. When it came back we changed the NSP board and again the problem went away but for only 2 weeks. We canged the board again and again the problem goes away but this time only for one week!The original prints do not have a designation for DS10 but are manuals show it as Oil Temp over/under. So we disconnected the thermostat. And we stll have the same problem. We have changed every board we can and also the power supply. We have also removed the valve coils so no movement of the car is possable and the car still times out at 13 seconds.We then kept the motor from starting and again at 13 seconds the car shuts down. This only happens between 1 and 2 because of the floor height. From 2 to 3 and 3 to 4 the car runs fine. We know that replacing the NSP board will cure the problem but they do not last long enough to be a practice solution. Any ideas we are fresh out?????