What was found
EMERGENCY EQUIPMENT, DURING C 16 CHECK DISCOVERED CAPTAIN'S OXYGEN MASK DEMAND REGULATOR STUCK IN EMERGENCY POSITION. MAINTENANCE REMOVED AND REPLACED THE O2 MASK IAW TASK CARD R1B35001. OPERATIONAL CHECKS WERE GOOD. VENDOR TEAR DOWN DOES NOT CONFIRM FAULT. VENDOR REPORTED THAT THE REGULATOR WAS NOT STUCK IN THE EMERGENCY POSITION AND THAT THE ONLY DISCREPANCY WAS THE FACEMASK LENS WAS CLOUDY. LENS WAS CLEANED AND UNIT TESTED GOOD IAW ATP 846114-TP AND ENGINERING SPESPECIFICATIONS 174660-N5 REV. B.