ESS and AESS should be hi in normal operation. ESB input can be jumped hi to bypass the ess and aess inputs. you probably have one or more than one bad input boards. sometimes if inputs are looking correct they are really bad. Try putting a meter on the inputs, 120vac if they show hi, and 0 if they are low. Also, outputs to ground are the same 210vac if hi and 0 if low. ESC should be low for normal service. No outputs should be blinking.