Decided to buy a replacement. When got the replacement switch, the switch are not interchangeable. There are slight different between AE111 and AE110 switch.
So can't change it. Then I've decided to dismantle the power windows switch, if lucky I manage to repair it.
A circlip that hold a pin for the cover of the switch.
After remove cover now can see the switch button
Removing all the upper part will reveal the copper circuit. Noticed that a burned mark when the circuit closed. After using it for more than 10 years, the contact pin are not in proper shape anymore. That's why it got intermittent problem.
What I did it reshape the contact pin to a suitable shape, so when push/pull the switch both contact pin are touching the base.
The whole power window switch
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