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Hmm. I'll take a look at that. Presumably that means dismantling the camera. Bugger.

Not sure about the IXUS 400 but I've taken an IXUS 300 apart and it wasn't too bad. There are some guides floating around on the internet to say how to dismantle it. The guides are actually to show you how to fix the problem with the lens assembly getting jammed.

You just need really small screwdrivers. Don't think there was anything special I needed.