Thanks. Having successfully followed the advice given here for my own DC03, I'd add that the narrow screwdriver is best placed either side of the upper edge of the yellow power switch, and not along the actual sides as I'd first interpreted the instructions. After that, look for the philips screw which is tucked underneath the power cable. Undo that and now the whole switch assembly will lift upwards. (There's no need to remove the long plate that you see on the inside of the flexible pipe assembly.) Crimped cable connectors are used which, with a bit of care can be levered open and re-used.
Parky, July 2009