It's been almost 8 months and I had to send in my car to AB Segambut for an unscheduled check after the external bulb warning light came on. It's weird though cos when I checked all external bulbs, everything seemed OK. However, at AB Segambut, a more thorough check revealed that the filamen for my rear braking lights had withered. Though it could light, the filamen fell apart when it was unplucked. What was more weird is that this affected 3 bulbs?!!! I dunno whether I should marvel or be suspicious of BMW's sensors that it was able to detect filamen weakness rather than warn only after the bulb had blown. In any event, the repair costed me RM66 (RM22 per bulb) which was not covered by warranty. I'm a bit concerned though that since 3 bulbs blew, this might not be a problem with bulb but power management? Barring any foul play, I should thank Hong for getting it fixed quickly @ AB Segambut.