If you are following this how-to because liquid/coffee splashed in through the back vents, WAIT UNTIL THE END to clean any liquid spills on the bottom panel. Use them as your map for cleaning and QA guide for checking until you are finished with your cleanup of logic board and other items.
green indicator: raised head screw is the one you removed the rubber cap from in prior step. (I removed – and then replaced — a different screw in this step. Revisited it with more daylight and saw my error.)