Amcron (Crown) DC300A - one IOC on at all times

Hello all,

I have an Amcron DC300A here with one IOC light that stays on all the time, but there is no audible difference between each channel.

Do the more experienced DC300A techs here have any idea what this could be? It is a recent change to an amp that was doing a great job prior to this warning!

Thanks in advance!