Here are both the builder blue prints and foundation plans. According to the plans all external walls and garage are load bearing and internal walls are not. There is no built up foundation/headers internally, only thickened on external walls.
I want to completely take down the wall running horizontal from the garage to the kitchen which includes closet, kitchen wall, half walls (lv rm) and where pantry (no longer there) are indicated. Since the trusses run perpendicular and the middle of the truss (middle of the A) is where the wall is, my S/O is arguing it is load bearing. Full disclosure: I removed a quarter of that wall (next to the closet) more than 10 years ago based on these plans—no sagging to date.
Best Answer
You really want to hire an expert. A house is probably the most expensive thing you will ever own; don't risk it if there is any doubt.
Usually, walls which run perpendicular to floor joists are assumed to be load bearing until proven otherwise. That doesn't mean walls along floor joists are not load bearing, but it's much less likely.
In older houses, walls may be carrying structural load even when they were not originally intended to, due to subsidence or past modifications.
Note that even load bearing walls can be opened up, by putting in a beam to take up the load and columns to transfer that load to adequate supporting points. Did that in my place, opening a 10-foot-wide passageway. But that really calls for an engineer to determine what will have to replace the wall, and involves building a temporary wall alongside it to take the weight during this process.... In my case the final result needed a double Paralam beam across the opening (equivalent to a hardwood 12x4 beam?), similar manufactured-lumber columns from that down to foundation and joist, and we had to sister that joist with a steel C-beam in the basement to help transfer load to the foundation and main beam. Definitely not something to attempt without expert on-site advice.