What was found
OXYGEN LO PRESS CAUTION MESSAGE IN CRUISE. PRESSURE WENT AS LOW AS 600PSI. PRESSURE WENT BACK TO NORMAL AFTER LANDING. MEL 35-12-1ACAT C, SMOD RTS APPROVAL REQUIRED DUE TO ODI EVENT. OXYGEN LO PRESS CAUTION MESSAGE IN CRUISE. PRESSURE WENT AS LOW AS 600PSI. PRESSURE WENT BACK TO NORMAL AFTER LANDING. (FLIGHT 4032 - FILED CLOSED) VERIFIED CREW O2 PRESSURE ON GROUND SERVIED PANEL, DEFERRED FLIGHT CREW O2 PRESS INDICTION EICAS READOUT IAW MEL 35-12-1A MX ACTION C/W PLACARD INSTALLED HISTORY NOTED