As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIRTY SOCK ODOR IN ACFT. ODOR COULD BE SMELLED FROM JETBRIDGE, TROUBLESHOT IAW TSM 05-50-00-810-831-A, IDENTIFIED THE CAUSE OF THE ODOR COMING FROM LEFT PACK. INSPECTED THE ENGINES AND APU FOR SIGNS OF LEAKAGE. NONE NOTED. PERFORMED A PACK BURN OUT IAW AMM 21-00-00. REMOVED AND REPLACED CABIN AIR FILTERS IAW AMM 21-21-41. NO ODORS DETECTED AT THIS TIME. NO OTHER DEFECTS NOTED.