As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: EQUIPMENT COOLING FAN UNUSUALLY LOAD ON THE FLIGHT DECK. IT WAS NOTICEABLE WHEN IT TURNED OFF ON CLIMB OUT AND WHEN IT CAME BACK ON DURING DESCENT. THE FAN OPERATION SEEMED TO BE ASSOCIATED WITH DIRTY SOCK SMELL. FOUND DUCT INLET VENT SCREEN COVERED WITH DIRTY MOIST DUST. WEATHER RADAR FAN REPLACED AS SUSPECTED LOUD FAN NOISE (AALA202602111407). ALSO REMOVED AND REPLACED EQUIPMENT FAN (AALA202602113093), PER 737 MM 21-27-04.