There was a case some time back on a B757 Freighter on a high security European flight (money) where the local plod insisted on inspecting the landing gear bays. So open the panel underneath, select the Door Arm switch and Doors Open. Nothing. Scratch head, check the books and try again -still nothing. So AOG - same system does the alternate gear. The B767 has the same system.
Congratulations to the crew for plugging the last hole in the Swiss Cheese.