[DDJ SX2] Activation/deactivation deck's light button - Remove potentiometer

Hi everibody !

I'm a little french dj and I've bought a DDJ SX2 last week. The DJ, who sold it, have disabled the light of the deck's button (button 2) and I really don't know relight it. Maybe I have to do a reset ? ( shift + button deck 1 --> (master's led flashing...) --> hold syncs buttons --> turn off the SX2 ) I will test that soon... So if you have an other idea, I wille take it ! :D

And I've got an other question (yes I'm boring xD) : how can I remove my potentiometer's plastic button ? On my SX2 the filter's button of the channel 3 is reverse with the headphone's button (the button above 'master cue'). I want to have a real filter's button and not a headphone's button on my channel 3 ! x)

If you don't understand : 

     Original button's line : filter filter headphone filter filter

     My button's line : headphone filter filter filter filter

Thanks in advance !

Thibaud