As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFTER TAKE OFF THE CREW SMELLED A TOXIC ODOR IN COCKPIT AND STORAGE IN FORWARD GALLEY AND A VERY STRONG ODOR IN BACK. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO PHL WHERE IT LANDED WITHOUT FURTHER INCIDENT. THE FORWARD GALLEY #2 OVEN HAD A BURNT ELECTRICAL SMELL AND WAS REPLACED PER AMM 25-19.