Actually, i got the replacement (after 4 months) by arguing and finally going to the top. However, I was told that Philips' policy on Warranty is that only the original Warranty holds. Nice folks, stinkin' policy.
BTW, all the attempts and fixing the drive will ultimately fail (you will save your disc though) as the problem is in the circuit board. I have not heard of one successful return to working condition once the tray freezes.