What was found
AFTER LANDING WHILE TAXIING TO GATE ALL PAX O2 MASKS IN CABIN DEPLOYED. INSPECTED NOTED LT FLT DECK PAX O2 OVERRIDE SWITCH CONTAMINATED WITH MOISTURE AND SHORTED OUT SWITCH. REPLACED SWITCH P/N S2802-002. ALSO NOTED 11AB, 13AB CHEMICAL O2 GENS ACTIVATED. REPLACED CANISTERS P/N 117028-03 11AB, S/N OFF NSN, S/N ON 9903986 13AB, S/N OFF NSN, S/N ON 9903984, SYS OPS TESTS GOOD.