Why do I see an active unmarked red led on the display of my CPU ?

1.    Issue
There isn't anything printed close to this LED on the LED display of my CPU , nevertheless this LED is ON !

2.    Product Line
this issue can be found on the following products :
BMEP581020
BMEP581020H
BMEP582020
BMEP582020H
BMEP582040
BMEP582040H
BMEP583020
BMEP583040
BMEP584020
BMEP584040


3.    Environment
N/A

4.    Resolution
When this LED is ON, it means that there are forced I/O on the PAC

5.    FAQ Applicable Conditions (Optional)
NA

Released for: Schneider Electric Canada