From what i have seen it is not the boot screen or the welcomehead.96.png. The animated screen comes after the welcomehead screen.
Here are some links to get the ball rolling for you. I test both of these programs and neither one worked on the apache.
http://forum.xda-developers.com/showthread.php?t=321638
and
http://forum.xda-developers.com/showthread.php?t=321503
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Startup Splash in v3.7 B&B