Unplug microwave, remove top, "several screws" you will see the control board mounted behind keypad, you should see insert screws where the top of the microwave was, there may be one or more so take your time. If you end up disconnecting wires make sure you know where they go, gently remove frame and leave the microwave door open so no latches get broken.
The SE error code is pretty well documented on many forums. It usually occurs because the edge connector on the ribbon cable that connects the display to the circuit board has oxidized from steam that enters the cabinet between the display houseing and the cabinet itself. It will cost you a minimum of $100 to have a technician service it. Or you can do what he will do and take it apart and clean the connector then reassmble it. Unplug it before doing anything. 2 screws across the top of the vent panel need to compe out, then open the door and slide the vent panel about 1/2" and remove it. Remove the center and right screws on the bottom of the cabinet, below the door. Remove the single visible screw at the top of the display panel housing and slide it up and remove it. Carefully remove the edge connector of the ribbon cable and clean it with rubbing alcohol on a q-tip. Reassemble in reverse order of the above instructions. You can usually get 2-3 cleanings to work ok before that fix doesn't work and you have to replace the circuit board. When that happens, it's the same steps to get to the board, but you then need to remove all of the wiring connectors (pay attention to the color coding and the type of connector for reassembly), and take the whole display/board unit out. Remove the screws that hold the board in place and carefully lift the board out. Replace and reattach wires then reassemble. All it takes is a #2 Philips head screwdriver to do this job.
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