As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) OXYGEN BAROMETRIC VALVE ELECTRICAL CONNECTOR HAD DIFFERENT POLARISING KEYS TO THE AIRCRAFT ELECTRICAL CONNECTOR AND COULDNOT BE FITTED. INVESTIGATION FOUND THAT THE INCORRECT CONNECTOR PN MS2464R14B15PN HAD BEEN FITTED DURING REPAIR INSTEAD OF THE CORRECT PN MS24264R14B15P6X CONNECTOR.