A bit of a change of pace from the BMS reverse-engineering in the last couple of posts. This is the flex board that forms the battery level indicator on the first-generation unibody MacBook Pros.
The LED driver is the Linear Technology LTC3219, and is controlled by the SMC over SMBUS/I2C.
About half way down the flex tail there is also a Diodes AH1802 Hall effect sensor which forms part of the clamshell/lid sensor (the other part being a permanent magnet behind the display bezel.
As usual, the KiCad project, PDF schematics, BoardView, and STEP are all provided in the Apple repository.
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