I’ve checked it out and I know from experience. The two negative Yelp reviews about my business are done by the same person several years ago, a guy who worked for my local competition. Yelp won’t change it unless I subscribe to Yelp (pay them).
So I checked out other Yelp reviews. If they are negative the reviews are held prominently for years, or until the business pays Yelp. — Kent Johnson