The camera is not user-serviceable (doing so would void warranty), so if what you are seeing are indeed dust specks on the sensor, the camera would need to come back to us for sensor cleaning and subsequent lens re-calibration. There will be a service and return shipping fees, unless the camera is under warranty. Without lens calibration panoramas will have large stitching artifacts and wavy distortions along horizontal lines that are supposed to be straight.
The dust may get formed inside the camera over time, for example from particles separating from the shutter. Most often, however, it may be dust or residue on the front of the lens that does not come off easily and may need wet cleaning. That being said and unlike in still photos, minor imperfections in panoramas, like dust, red ghost spots or small stitching artifacts practically never cause end-user complaints, as the user is focused on processing the enormous amount of information available in 360 images.