Take the front nose off (6 small Allen key bolts) Then a torx screwdriver to remove 4 bolts...headlight's drops out... Round the back twist the plastic cover and gain access to the bulb....easy as...
Well there is nothing wrong with the bulb ... poped a new one in just in case but still no dip bean , ive got side lights and main but no dip
Put a meter on the plug (that connects to the bulb) and test....then id be looking at the swtichgear....take it apart and give it clean out with some wd and buff up the contacts. My z1ooo sometimes has a bit of a wilt on full beam as im rarely out at night....