Unplug the AC cable and remove the Upper Case and PS Duct.
2.
Connect the two terminals shown below through a 10 kOhm resistance. (Electric discharging will take about 10 seconds.)
3.
After the resistance connected in Step 2 is removed, measure the voltage between the two terminals. Restart the work after making sure the voltage drops below 60V.
When working, make sure to wear insulated gloves such as rubber gloves and pay attention not to get electric shock.
When connecting the terminals, use crocodile clips and make sure to securely connect them.