Hmmm funny that, I still start that 146 APU every other day, and guess what, no fumes! But then, you don't get fumes if you maintain your APU, engines and AC packs properly! Not spraying de-icing fluid all over the APU bay helps too.
Bad as it is that the 146 has quite wrongly been saddled with a reputation for fumes problems, it is somewhat satisfying to see the number of serious incidents the 757 has had... kind of puts to bed the lie that this is a 146-specific problem...