I've got this dark brown ooze coming out from behind the stucco (through the weep screen I believe) and visible in some of the cracks. This is only visible on the extreior of the first floor (2nd floor exterior looks fine). What concerns me most is this same brown ooze is showing up on the interior wall of the same side of the house. The ooze is coming out of a return air duct. Any thoughts?