Can anyone tell from the drawings if there is a load-bearing wall here or if any other interior wall is load-bearing? It's a single-story house with W-trusses
In image 3, it undeniably looks like the standing studs that go all the way up are supporting something heavy since it appears that the boards above sag where they don't have support underneath. If this carries something vital, I have no idea, but I do believe that something will come down if you poke them away.
I had a similar problem 30 years ago with roughly the same type of roof trusses as the original poster. Got the tip to check the original building permit drawings at the municipality (the house was built in 1968). It was clearly stated that the roof trusses were self-supporting. I demolished the suspected "load-bearing wall" with great trepidation, nothing happened. After 30 years no cracks, no movement but a large and lovely kitchen.