Brazil's Oi to press ex-CEO on investment by Portugal Telecom

SAO PAULO, Jan 12 (Reuters) - Brazilian telecom Oi SA will seek clarification from former Chief Executive Zeinal Bava about a report by auditor PriceWaterhouseCoopers regarding an ill-fated investment by Portugal Telecom SGPS before their merger, according to a securities filing on Monday. (Reporting by Marcela Ayres and Brad Haynes)