What was found
OXYGEN LEAK. PERFORMED LEAKS CHECK OF CREW O2 SYSTEM LINES IAW AMM 35-11-00. CHECKED AND TIGHTENED LINES IAW AMM 20-11-00. CHECKED CAPTAINS, F/O, AND OBSERVER MASKS FOR LEAKS, AND PROPER STORAGE IAW AMM 35-11-51. NO LEAKS NOTED, SYSTEM OPS NORMAL AT THIS TIME. LP 1088963 - M4: REMOVED AND REPLACED CREW O2 BOTTLE IAW AMM 35-11-00, AMM 12-15-08, AND GMM 3.25.3. LEAK CHECK GOOD, OPS NORMAL AT THIS TIME.