The Sensex opened with a positive gap of 58 points at 13,236, but soon slipped into red to a low of 13,149.The index has now rebounded into the positive zone and is now up 35 points at 13,214.Reliance Energy and Tata Motors are up over 1% each at Rs 519 and Rs 711, respectively. Ranbaxy is the other prominent gainer.SBI has slipped 1% to Rs 978. ICICI Bank and HDFC Bank are the other notable losers.