XDJ-XZ "low" button led in the effects section does not illuminate.

so I do not know if it worked or not before the latest firmware (1.26) but for sure has not since. Now I bring this here as I have seen at least 4 others that people I know have that have to same exact led out on their units. which makes me wonder if there is a reason for only this led not to work on mine and others XDJ-XZ units.

To be honest I am not sure if the button functions or not, as if I try to use it, it does not do much, if it is working.

so is this a known issue and is someone working on a fix? or is it a hardware issue?? where I need to order a replacement board to get it to work??