I finally got around to removing the DVD player and clean the laser lens, and, up to now, it's working well. Just a few points to anyone doing the same. I nearly gave up when trying to remove surround, I was quite sure I was going to break it if I pulled much harder, but with a lot of wiggling, jerking and under the breath muttering, the two clips at the top finally gave in. When refitting the fiddly bits of metal in the top of the DVD unit, I found it easier to hold the bottom plate up to top plate ready to take the small screw by putting two dinner knives in the DVD slot at the top and bottom of the plate. And, finally, as the guide says, do take pictures of the top of the unit after removing the lid, it definitely helps when knowing how to interlock the plates when reassembling.