Step 10
Remove the orange tape securing the trackpad ribbon to the logic board.
Disconnect the trackpad ribbon from the logic board.
Remove the upper case from the computer.
Step 11 — PRAM Battery
Use a spudger to pry up the PRAM battery from the optical drive.
Step 12
Disconnect the PRAM battery cable from the logic board and pull the PRAM battery out, removing tape as necessary.