As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(B-6718) STATUS MESSAGE ELMS P310 CHANNEL AND PAX OXYGEN ON, DURING CURISE AT FL 380. ALL PAX OXYGEN MASKS DROPPED. CHECKED THE CMS, FOUND FAULT CODE 24001103 ELMS P310 CCU M24510 FAIL . REPLACED THE CCU AND TEST PASSED. REPLACED THE SIU AND CABIN PRESSURE SENSOR FOR PREVENTION. RESTORED ALL PASSENGER OXYGEN MASKS AND GENERATORS.