As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BWI - FLT 1969 - CREW REPORTED, THAT AFTER STOWING AN OXYGEN MASK, A FOUL ODOR WAS DETECTED IN THE CABIN AND COCKPIT. A DECISION WAS MADE TO RETURN TO FIELD AT BWI. NO EMERGENCY WAS DECLARED AND THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED CONNECTOR D4074J WHERE TWO PINS WERE FOUND SHORTED. (M)