As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VERY STRONG ODOR (MUSTY) WAS PRESENT FROM TAKE-OFF THROUGH FIRST 20 TO 30 MINUTES OF FLIGHT. CLOSING A/C VENTS WOULD DECREASE THE INTENSITY OF THE ODOR BUT WOULDN'T ELIMINATE IT. REPLACED BOTH WATER SEPARATOR COALESER BAGS IAW DC-9 MM 21-20-02-2-0001.