NOPE no written confirmation. I tried searching varios SIB but nothing concrete. What i said is partially my speculation and my SA's word. During my 2nd service (not aware of new service rules) I blindly thought they would do drain and refill. Then someone in another thread mentioned under new service rules he got top off on 1st service. My invoice said they did drain-refill. To confirm I called up my SA if they bypassed rules to make more money. He said they do drain-refill on 2nd service and my speculation is that they will do it on 4th service as well.
335d Black Sapphire/Biege/Premium/Sport/Cold/Nav/CA/PDC/iPod