The microswitch is the black plastic rectangular solid that is circled in red in the first photo. It is attached to one red wire and one white wire.

Pull off these red and white wires by pulling on the connectors, after first noting that the white wire connects to the terminal closest to you, while the red connector attaches to the terminal deeper inside the unit. The connectors may have mechanical latches that you have to depress in order to slide the connectors off.

The microswitch is held in place by a single Phillips screw. It may be difficult to remove, particularly if there is Loctite on the threads, but if you persist you can remove it without damaging anything.

In the second photo, the microswitch has a tiny plastic finger that is pushed to activate the switch.

In the third photo, scrape off any corrosion on the switch connectors, leaving the metal shiny.

Attach your multimeter to the switch terminals. Check the switch continuity as you press and release the tiny plastic finger. If your rice cooker is like mine, nothing happens because the switch is defective.