Just a question, Boss. Chrysagon is still at 17/20 (he took 3 damage during the zombie fight). After a short rest the least he can get is 3 hp (CON +2 and 1 dice). But maybe I missed some damage he took in the ziggurat.
No, you investigate to FIND the trap (or its control panel, or how to get at its mechanism, or whatever) and an ability check to disarm it.
That saves me having to dip into Investigation. Harb is wise, but not very smart.They are absolutely not clear. After much discussion and research, I am confident that you can spot the trap's trigger with a passive (or active) Wis: Perception, or you can "search for traps" with Int: Investigation (Advantage using Thieves' Tools from Xanathar's). Either way, once one or the other of those two things are successfully done, you can disarm a trap with a Dex (Thieves' Tools) check.