I had to use some creative exploits in my attempt to solo a dungeon.
http://www.reddit.com/r/Guildwars2/comments/10ypy1/world_first_explorable_soloed/
The main ones are the place I stood for the carrier event.
The way the 2 pack champion mobs don’t chase you.
The place I stood for the very last boss phase 2.
PM me if you need better locations/descriptions etc etc.