As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUMES EVENT PILOT AND F/A BEGAN TO DETECT AN ODOR DURING CLIMB OUT ABOUT 28000. FUMES CHECKLIST INITIATED AND ODOR DISSAPATED, ODOR DISAPPATED AFTER LEAVING CLOUDS AND A/I OFF. ALSO NOTICED P6-4 01 CIRCUIT POPPED. FOUND OVERBOARD EXHAUST VALVE CIRCUIT BREAKER POPPED. R & R OVERBOARD EXHAUST VALVE IAW AMM 21-27. OPS CHKD GOOD NO BURNING ODORS, LOG #1687227. (8721304) AIRCRAFT WAS GROUNDED.