It seems PBR is being eaten up the past few sessions. Its bounced off its 52 week low with unusually high volume. Perhaps it has cleaned up the books and moved in the right direction. The last financial reports were actually not that bad. The drop in gas and high operation costs may have triggered the slide to its current price.
Its on my watch list though in case this high volume is followed by huge news. Its interesting to note there have been no inside trades since last year.
Its is likely they will announce a roll back and then a re issue of shares to cover debt before moving forward. Right now its a high-risk move to buy.