As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, FUMES WERE NOTED AS THE AIRCRAFT WAS PRESSURIZED. THE AIRCRAFT RETURNED TO OAK FOR AN UNEVENTFUL LANDING. THE SOURCE OF THE FUMES WAS DISCOVERED TO HAVE BEEN A RUPTURED CONTAINER OF ZIOLIN LOCATED IN THE NUMBER ONE CARGO POSITION. THE CONTAINER AND THE RESIDUAL LIQUID WERE REMOVED BY CONTAMINATION SPECIALISTS.