Quality scan of the actual service manual, just what I was looking for.
Text excerpt from page 28 (click to view)
9.4.2. Remove the Air Filter.
- Lift the air filter by the holder and pull outwards.
9.4.3. Remove the Front Grille.
1. Open the Control Panel cover. When performing the following steps, do not pull the bottom edge of the Front Grille towards you more than 3 inches or you may damage the top tabs. 2. Press inward on the Cabinet near the bottom right side of the Front Grille while pulling the Front Grille to the right then slightly towards you to release the right tab. 3. Press inward on the Cabinet near the bottom left side of the Front Grille while pulling the Front Grille to the left then slightly towards you to release the left tab. 4. Slide the Front Grille upwards to release the two top tabs.