The access panel below the dishwasher had broken loose from the upper screws.

The panel was removed by removing the lower screws and lifting the panel out. The old panel had a wood insert to match the cabinets in the kitchen. I removed the upper plastic piece holding the wood in place and slipped it out. I inserted this into the new access panel and attached the upper plastic piece to hold it in place. I detached the metal vent piece from the bottom of the old access panel and snapped it into the new panel. I then slipped the metal vent over the lower screws and tightened them. Finally I inserted the upper screws and tightened the panel into place. It took less time than I expected and only required a nut driver and a screwdriver.