Fralex
Explorer
Intelligence (Investigation): "Chuck Dagger tries to figure out how this trap on the door works."
And every example above assumes that the action Chuck is taking has an uncertain outcome or else no check, passive or otherwise, would be necessary.
See, this is the sort of thing where I feel Investigation would be better-replaced by an Architecture and Engineering check. Your knowledge of how mechanical things work would determine whether you notice and figure out the hidden mechanism, 'cause you know what to look for.
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