As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIRTY SOCK SMELL ON INITIAL CLIMB FROM OMA. TURNED OFF RECIRC FANS, SMELL WENT AWAY. KEPT FANS OFF. GROUNDED - YES. ACCOMPLISHED F.I.M TASK 21-00 TASK 804. REMOVED AND REPLACED RECIRCULATION AIR FILTERS REF. AMM 21-25-01. FILTERS FOUND VERY DIRTY. PERFORMED OPERATIONAL TEST OF RECIRCULATION SYSTEM REF. AMM 21-25-00-710-802-002. OPS TEST GOOD. NO ODORS OR DIRTY SOCK SMELL NOTED. OK FOR SERVICE.