Factiva: In the top navigation menu click Companies/Markets. Then search for a company. In the company snapshot, select News from the menu on the left. Select Press Releases in the "Suggested Categories" menu.
Click Menu and select Company Dossier. Search for a company. In the company dossier select News > Press Release from the menu on the left.
Or use the "Guided Search" tool. Click A Publication. In the first box ("Search for something specific?") type the name of a company. In the second box ("Find publication") search for PR Newswire and select it. Then hit search.