As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE CREW OXYGEN DISTRIBUTION TUBING HAS BEEN FOUND IN PRODUCTION TO CONTAIN KRYTOX (PTFE (20-30%) PERFLUOROPOLYETHER (70-80%)) IN THE FITTINGS. THE CREW OXYGEN DISTRIBUTION SYSTEM SHALL BE DESIGNED TO BE CLEAR OF CONTAMINATES. THIS CONDITION EXISTS ON 100 AIRCRAFTS (CRJ700/900/1000). BOMBARDIER HAS A CONTINUING AIRWORTHINESS PROJECT OPEN FOR THIS ISSUE (RJX-CA-35-17) ++X++ (TC# 20160113004)