if array contains "this" then set at X/Y "that" (need help)

Hello,

I'm using array for generating a house.

I have a "stairs1" somewhere in my array, how do I retrieve it so I can set a "stairs2" above it ?

What I have so far (and not working at all):

On start of layout

For each XY elements

Value at Array.curX, Array.curY = "stairs1" ----> set value at Array.curX, Array.curY+1 to "stairs2"

Thank you if you can help !

EDIT: got it working, was a stupid mistake somewhere else...