As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 5811 -FUME- A OILY DIRTY SOCK ODOR WAS REPORTED IN THE COCKPIT AND CABIN, O2 MASKS WERE DONNED. CORRECTIVE ACTION: FOUND SLAT BYPASS VALVE LEAKING INTO (L) PACK BAY, SECURED LINE, CLEANED PACK BAY OP CHECKS NORMAL. C/W REMOVAL OF OIL CONTAMINATION IN A/C SYSTEM PER B757 AMM 21-00 AND REPLACED RECIRC FILTERS. NO ODOR PRESENT.