Reminder signal and message to change filter on microwave digital display.
Removed 2 screws on the top of the microwave and removed top/front piece of microwave. Slid out old filter (which didn't look dirty at all) and replaced it with the new one. Replaced top/front piece and 2 screws. It took less than 5 minutes.
I had no problem installing the new filter. Just used a phillips screw driver to remove the two screws holding the vent cover in place. Cleaned the dust out of the ducts and reinstalled the new filter. The screws must be held to the screw driver with your finger tips so you don't drop them in the vent cover. The most difficulty I had was in clearing the clean code from the screen. There are no instructions in the owners manual for doing this. But after several tries I got it.