Audiolab 8000T faceplate bulbs

All the bulbs in my 8000T are still working fine, but I can see another problem looming on the horizon the day one eventually burns out: I can't for the life of me figure out how to open up the case on the this piece without feeling like I'm about to damage something, so I've never even seen the inside. Am I missing something simple here?

Seeing this thread pop back up again, I can now happily report that the mysterious trouble in opening my 8000T's casework has been solved: for some reason, the stamped steel cover on my example was epoxy-bonded to the top of the aluminum faceplate extrusion across the unit's entire width! I don't know if this could have been done at the factory or whether a previous owner must have been responsible, but it took a scary amount of effort and a leap of faith that I was prepared to break my tuner should I be wrong (I couldn't see what was going on until it was opened) in order to pry the damn thing off. The result was a separated but fairly bent top cover, but I was able to reflatten it out pretty well afterwards.

Fortunately, I found out the preceding before my unit's bulb has needed replacement. Thanks Dcb49 for the tutorial. It's interesting to note that a mega-tuner-comparo webpage I've forgotten the name of advised that the 8000T be left permanently powered-up for best sound, something I've never tried for fear of burning up the bulb even faster.