Jimmy u

Hi guys I'm new to the forum. And have a problem I hope you could help with. I have a 2011 wrx sti, when I start her from cold. I hear a winning noise from the engine. It lasts for about 30secs and stops. It's around top of engine near power steering pump. Water pump area. It's like a metal on metal wining noise. It has me baffled. So any help would be appreciated. Thanks