Some tips for flight crew
Today I was asked by 777-300ER crew to do a WXR L ground test due to intermittent graphic faulty during flight. Never do it on the ramp please. Somebody won't have baby anymore. Or you burn yourself if refueling in process.
If cabin crew report to you that water tank QTY decrease quickly, pull the handle right onthe top of L2 door inside of a small square access panel. you will save half of water. The problem caused by somebody forget to close the LAV water drain vlv. Normally this would happen on a longhaul flight.
Have a nice flight.