Knowing what to look for now, Elthic manages to find the mechanism that turned the stairs into a slide trap before. Even with knowing what he was looking for though, it wasn't easy. The locks may be simple in this place, but whoever made this trap put some dwarven-style patience and care into the making of it.
OOC: Assuming here (to save some time) that Elthic would try to Disable Device on the trap since he found one. If that's not what you want to do, then say so and I'll negate this section.
Elthic attempts to disable the trap on the stairs, but his first try fails. Luckily, no one is on the stairs when it happens. After the stairs reset themselves in place, the dwarf gives it another shot and gets it locked in place this time. No way those stairs are moving now!
"Welcome back." Says the voice with only a bit of sarcasm. "So, you think the third time will be the charm for you all? Lucias must be paying you very well indeed. Unusual for that tightwad." The voice comments.