What was found
AFTER T/O EICAS MSG OXYGEN PAX ON DISPLAYED DOOR 1L 2L DECMP ALE RT REF MM 21-31-00-700-806-001, ACP MAT TEST ON LEFT AND RIGHT CABIN PRESSURE CONTROLLER SYSTEMS. BOTH PASS MTC MSG 35-13012 TECH SUPPORT UPDATE: INFO ONLY, PER AHM MESSAGE 35-13012 WAS GENERATED DURING INITIAL CLIMB, THE SAME TIME THAT THE FLIGHT CREW INDICATED THAT THEY SAW THE PASSENGER OXY ON EICAS ADVISORY. IT IS LIKELY THAT A COMPONENT COMMON BETWEEN THE TWO SUCH AS SIGNAL CONDITIONING CARD M24412, COULD BE THE ISSUE. ADDITIONAL NOTE, JUST REALIZED THAT APU FUEL ISLN VLV IS ALREADY ON MEL, SEE L/P 9896962. REMOVED SIGNAL CONDITIONING ASSEMBLY M24412 (ASSEMBLY ALSO INCLUDES CARDS M24410 & M24411). PER AMM 24-09-00-000-801-001 , AND REPLACED RELAY K35003. REMOVED AND NEW PARTS LOCATED BY TECH SUPPORT READY ROOM. REPLACED SIGNAL CONDITIONER ASSEMBLY PER AMM 24-09-00-000-801-001. CARD INSTALLATION TEST OK PER AMM 24-09-00-000-804-001. NO ELMS P310 STS MSG. OPERATED CABIN PRESSURZATION/DEPRESSURIZATON REF AMM 21-31-00. FOUND NO LEAK AND NO MESSAGE ATM.