As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NITROGEN GENERATION SYSTEM OPERABILITY INDICATOR DEGRADED (BLUE) LIGHT IS ON. BLUE LIGHT ON NITROGEN GENERATOR. PERFORMED ELECTRICAL TEST FAILED OXYGEN SENSOR MESSAGE 47-30062 REF FIM 47-31-TASK 838, CHECKED UNIT, FOUND NO FUEL SMELL REPLACED OXYGEN SENSOR IAW AMM 47-42-03, PASSED TEST LIGHT IS NOW GREEN OK FOR CONT, SERVICE REMOVED FROM MEL.