I'm not the expert on all brands of burner. I use Yamaha but don't need SD2 defeat. The issue with SD2 is that EFM encodingis needed. Look up the burners (SCSI support for EFM devices is rare) on the CloneCD site (www.elby.de). DA_-RAW+96 mode is important for PS/PX2 CDs.

I don't think the 55S supports the DA0-RAW+96 mode and you should thus read and write from the replacement burner.

Good luck. I've posted a link that makes interesting reading for you.
####://www.cdmediaworld.com/hardware/cdrom/news/0101/safedisc2.shtml