Currently (Wed, 13th) with the new patch if you change from heroic to normal mode while your raid is inside of the isntance, or vise vers, the trash will reset in ICC, including Precious. It also porst you back to the begining.
Easy for farming rep if you still need it, or if you want to farm the ribon with a group that's open too. I dont think there's going to be many 25 raids that would do this, but a small guild that runs 10 would have this available.