Hi,
It is from machine decurler, that on the right side of the fuser. Check the condition (clean the sensor) in decurler.
That is just a decurler fault, (Decurler Cam Upper operation failure is detected.) it should not disable the printer UI.
Shut it down and unplug the finisher, then boot it back up with the finisher still unplugged, see if you can get farther to get the rest of the faults.
Hi,
Give the error from "Fault History", pleae!