Going back to the original topic (and I know this was a while ago, but I thought it was worth posting).
I took my 2007 Brera 2.4 JDTM into the dealer today. Very similar problem.... Slipping power steering belt on very cold mornings. I left it to warm up for 5 mins, and everything was perfect.
Fortunately the today was bloomin chilly, so the Brera performed the nasty noise for the mechanic. I went to pick it up and was told there was an "outstanding service item" (which I guess is a recall!) to clean out the pipes and replace the red power steering fluid with the green stuff.
The green fluid looks thinner than the previous red fluid, but that may just be my imagination!
All was done under warranty, with some good service from Sturgess Leicester.
Just for information.