Manual says "push and twist anti-clock wise to remove", that's normal and have replaced many bulbs before, but in the 99' Disco II, the blue bulb holder seems to have some kind of retaining device and can't see how the bulbs is to be removed or even replaced?

I don't want to crack the housing, anyone?

EDIT: okay, I was able to wiggle the bulb free, I was thrown off by the narrow retainer ring, which does not come out.