Speaker panel? I don’t think this is correct - I accidently pulled the black & red wires out from this part and sound still worked fine. Is this instead a battery connection?
I have the 800 Mhz model and I had a T7 Torx here, instead of a Phillips head.
I'm using a T9 here as my T8 is way too small.
It is also the same for the iBook G3 500 MHz (late 2001)!