fridge bottom 25 degrees, top 50 degrees regardless of FF control setting

I replaced the damper, no change. Damper is always open, and opens again later when I hand close it, but I feel very little air flow. Plenty of air flowing out vent at bottom of fridge. Fans seem to run, or at least I can hear fans.

Ideas? Encoder board? Mother board? A fan somewhere?

Freezer is at zero, no frost build up inside.

Thanks!