Probably Not Very Load Bearing

[jyl]

Originally Posted by john70t

Repeat. Because it's important.

From roof to ground..
An entire section of 2nd floor floor joists might be using that header and wall to split the load in half. Long span.
From the look of it it probably is.

Take a measuring tape and go in the basement. There should be a supporting wall under that one.

There is a wall in the basement under that one. Without opening it up, I can’t say it’s construction.

[look 171]

Don't over think it. If that was the original pocket door in that spot, the header is there to carry the weight of the ceiling joist. Your new opening is only 24" so it like using a 50 lbs line to catch a bluegill. No effort at all