As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OXYGEN SUPPLY LINE WAS FOUND TO HAVE A HOLE RUBBED INTO IT FROM RAM AIR DUCT (THE DUCT SUPPORT COIL). A VISUAL INSPECTION OF THE AREA, WHEN ON GROUND, APPEARS TO HAVE CLEARANCE. BUT OUT BELIEF IS THAT IN THE AIR WITH RAM AIR COMING IN IT BOTH EXPANDS AND MOVES THE DUCT TO RUB THE OXYGEN LINE.