Yes, all four rotors can be machined down on the 348. New Ferrari rear rotors were just (may still be) on sale at TireRack for $75 each.
The fuel filters are Bosch canisters. Here's how to change them:
http://webpages.charter.net/aircover...ngineUnderhood
They only cost $14 each here:
http://www.drivewire.com/
(enter 0 450 905 601 and then click on the Search button on that web site)