PHP 5.2.17 and 5.3.29 have now been removed from Plesk. 5.3.3 is still available using "Apache Module" as that is the patched OS vendor version.
If you were using 5.2.17 or 5.3.29 you have automatically been switched to 5.4.35.
We are no longer able to maintain these PHP versions on our Plesk servers. We can continue to offer these versions along with a few others on our NYC cPanel server due to the additional isolation and protection available on that platform.