Help: Stucco Leaking Water in Los Angelesl

We have a 3-story apartment building and are having major water (rain) intrusion issues along the back wall of the building. Does anyone have a recommendation for a stucco inspector and/or stucco replacement contractor?

To provide a bit more context:

- the first floor is a parking garage with concrete block walls and stucco siding

- the second floor - the first habitable floor) is having significant water seep into the back wall (stick framing, stucco siding). The water damage stretches from the header above a sliding balcony door all the way down the drywall on both sides of the sliding door and even to the abutting kitchen’s drop ceiling. All-in-all, it spans ~15 feet right to left.

- Above the sliding door / balcony of this unit is another balcony for the unit above. We recently had that balcony completely resurfaced, so we shouldn’t be having any slope / waterproofing issues from the deck of that balcony.

- We’ve also inspected the roof / parapet wall, but don’t think those are the culprit because the issue presents itself on the 2nd story, not the 3rd story that’s immediately below the roof.

- Plumbing issues have been ruled out. The water only infiltrates when it’s raining.

Thanks in advance!