I tried to change my own headlamp bulbs on my 2001 S60 2.4T, which one wouldn't expect to be difficult. I got the passenger bulb replaced okay a few weeks ago (it had burned out), but afterwards noticed the lights were no longer aimed quite alike, the new passenger light seeming to shine high and to the right. But I had no error messages on the onboard message center. Yesterday, I undertook to change the driver's side bulb. Not only was it nearly impossible to access, thanks to some plastic wiring conduit that runs over it, the stays for which broke in the process, but I couldn't get the bulb unplugged from the socket. Now, I get an error message "Bulb Failure Position Light". I have tried wrestling the old bulb into position, but it seems to be where it belongs. The retaining clip is in place.

What could this error report mean? Have I broken something? How does one get the bulb unplugged without breaking things?

(sorry for a duplicate post, but to maximize responses I'm posting both here and volvospy).