What was found
NOTED OXYGEN QTY AT OR NEAR 0 ON ALL 4 SYSTEMS AFTER LANDING CHECK, NORMAL RANGE DURING PRE-FLIGHT. UPON PRESSURIZING THE O2 SYS, FOUND NR 2 JUMP SEAT OXYGEN MASK WAS LEAKING. RESEATED & STOWED O2 MASK PROPERLY & LEAK CHECKED GOOD. NEED TO REPLACE BOTH NR 1 & 2 OXYGEN BOTTLES, HAVE ONE IN STOCK & REPLACED SAME IAW AMM 35-11-01-4. WAITING FOR 2ND BOTTLE ARRIVAL. REPLACED BOTH NR 1 & 2 OXYGEN BOTTLES IAW AMM 35-11-01-4, LEAK CHECKED GOOD. NR 3 & 4 O2 BOTTLES DEFERRED, SEE WRI 35-10 2224.