Poer Gear Jack problem

[s_N_s]

Friends have an 08 Gulfstream with Power Gear jacks. They cannot get them to deploy. Touch pad is a P/N 140-1226 and the Control Box is #140-1224. When you turn on the system the Manual, Auto, Front and Left lights are blinking and the Jacks Down light is also on but none of the jacks are down. Any Ideas of what may be going on? Any and all comments would be a help. Thanks Steve

[demoon]

I assume the parking brake is on. Don't have any idea about at Gulf Stream, but on our Surf Side with Power Gear jacks, the engine must be running.