CD80 Pack Preheat?

Posting over here since I expect we have better old school knowledge here rather than FB.

I've been working on an old CD80 pack and I have a ghosting problem with every channel without any incoming signal. This is a 12x2.4k pack with a control card that will run DMX and 0-10v so this has me wondering if there is a voltage leak into the analog circuitry. I can't find any info on these any longer and it don't see any sort of Preheat setting on the control card.

Anyone have any recollection of these things and if this was a known issue?
 

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