GTO 52 stopped inching/running PLEASE HELP

Hello,

My GTO52/5 just stopped working.
as we were inching it, the machine just stopped. on the panel at the paper exit, the red light is on. on all of the printing units, the blue light is on solid( without blinking). what are some possible things what I can try to get us back up and running.
thanks in advance to any responses

 

check the following: the sensors on the front lay, if paper is jammed in-between the front lay grippers and in-between units grippers, then monitor the contactor switches in the panel for a switch-off.