Hello to all. I am trying to figure out what is happening with my Arrow 750. When I power up, the display shows the NCA Air Pressure Alarm for switch PS_AIR_SYS(I00:00/01). I have temporarialy jumped the 4 air pressure switches on the back off with no luck. Also, this machine has the DropsA oil lube unit installed. The LED lights that show pump healthy etc. do not light up. Any ideas on what could be causing these problems?? Any advice will be greatly appreciated.