[TenTec] Orion sub receiver getting no signals

[denton sprague]

Hi all…my trusty Orion that came back from TT for processor board replacement a few months ago seems to have no  receive signals…this happened this am when booting up the rig.
I use ant 1 as main rx/tx as well as sub rx. 
I can hear the sub noise come up when pressing the sub rx button, but evidently getting no signals from the antenna.
I have only one hf antenna.
Did a master reset to no avail.
loose cable maybe??