I am trying to troubleshoot our cat NRR40 lift truck Ser# 2nl01400, the problem is that i cant lift or lower the forks. The motor isnt turning on when it should, however when it starts up it the motor turns on for a second, and if you manually close the contactors you can make it work. The hydraulic driver board has an led that comes on when you try to lift or lower. But the power panel driver led does not. I have swapped the hydraulic driver, power panel driver, and vehicle manager with known good items out of one of our other lift trucks and the problem persists.