Remembering world location after timeline play

When a Timeline reverses it goes back to the first key you set. Make sure it’s value is at 31 and not 0.

Hello. I have a slight problem which I cannot seem to work out. Not very good a maths :). Anyway, I have made a garage door that opens based on a timeline. The problem I am having with the door is getting in not to move location to 0,0,0. I have solve X,0 and Y,0 by getting world location of my door. However I cannot work out how to get the timeline to reverse correctly to its original Z position

. I have attached a picture of my BP. When the timeline reverses the door reverses to world Z,0 but the door is actually at world Z,31. Thanks for your help in advance.

You are a god!! thank you so much.