One leg of 24 rack functioning as FF @ 1%? Help? (xpost to lightingdesign)

Hello. I am an LD helping out some friends who recently took over a small summer stock - I'm just enough of an electrician to get myself in trouble. Details of the issue:

* Console: Element 60 * Rack 1: Sensor 24 rack, no CEM * Rack 2: Sensor 24 rack, CEM+

Both racks are on the same power supply, w/ cams split between them.

Rack 2 functions correctly - I list it as rack 2 because it was addressed at starting address 25, even though the CEM considers it as rack 1.

Rack 1 has some issues. Dimmers 9-16 (Leg 2, if I understand correctly?) are functioning as "full at 1%."

To forestall the obvious questions: there is no curve on those dimmers in the console. Moving the affected units to an open dimmer solves the issue.

Not sure if this is something I can solve, or if the rack needs to be serviced. Any advice is appreciated. Thanks!