Apple has released
Slot Combo Drive Update
v1.0, an update intended for Xserve servers and PowerBooks equipped with internal slot-loading Combo drives.
The update installs new firmware on PowerBooks and Xserve Combo Drives. Apple noted that the update prevents Combo Drives on these machines from intermittently failing to eject discs.
If you already have a disc that won’t eject stuck in a Combo Drive, Apple said that you can’t use this update app to update the firmware. Apple recommended contacting AppleCare for service.
The update measures 1.4MB and requires Mac OS X 10.1.5 or later.