What was found
UPON DISASSEMBLY OF THE LEFT LANDING GEAR RETRACT/EXTENSION CYLINDER, THE MAIN END CAP O-RING (AN 6227 B-10) WAS FOUND TO HAVE FAILED. THIS O-RING CONTAINS THE FLUID AND KEEPS IT FROM ESCAPING TO AN EXTERNAL LEAK ON THE LANDING GEAR DOWN SIDE. UPON CLOSE EXAMINATION OF THE FAILED O-RING, DETERMINED THE FAILIURE WAS CAUSED BY THE O-RING BEING INSTALLED WITH A TWIST, WHICH IS STILL EVIDENT IN THE OLD O-RING. THIS TWIST CAUSED A PRE-LOAD IN THE CROSS SECTION WHICH EVENTUALLY CAUSED THE FAILURE AND SUBSEQUENT FLUID LOSS.