I have just found a couple of excellent videos on dismantling the TZ series. Here's a handy video on TZ sensor cleaning: https://www.youtube.com/watch?v=0nmwt0frZns I have just removed a huge dark blob which has driving me mad for ages. Took less than 10 minutes total using a tiny, straight bladed watchmaker's screwdriver. The TZ screen is also a piece of cake to remove. https://www.youtube.com/watch?v=o9O43EOkiKY It's so easy when you are shown how. Note dire warnings on doing any of this while still under guarantee!