Apple MacBook Pro 17-inch (original, Core 2 Duo, 2.4GHz, Late 2007 CTO, Early 2008, and Late 2008) - Manual (Page 96)

MacBook Pro 17-inch (original, Core 2 Duo, 2.4/2.6GHz, 2008) Take Apart — Ambient Light Sensors 96
Procedure
The right ambient light sensor is part of the logic board and is not separately replaceable, but
has a removable dust cover that attaches with a small screw to the right speaker.
The left ambient light sensor is part of the left I/O board and is not separately replaceable, and
has a dust cover glued onto the left speaker that is also not separately replaceable.
To remove the right sensor’s dust cover:
Remove the Torx T6 screw shown. 1.