What was found
(AIRCRAFT GROUNDED) DIRTY SOCK SMELL REPORTED BY AFT FLIGHT ATTENDANTS / REMOVED AND REPLACED RH RECIRCULATION FILTER (4012HM) AND LH RECIRCULATION FILTER (4013HM) IAW AMM 21-21-41-000-001-A AND 21-21-41-400-001-AITEM: 1REMOVED AND REPLACED RH RECIRCULATION FILTER (4012HM) AND LH RECIRCULATION FILTER (4013HM) IAW AMM 21-21-41-000-001-A AND 21-21-41-400-001-A. REMOVED AND REPLACED LEFT HAND OZONE FILTER (100HM) IAW AMM 21-51-41-000-001-A AND AMM 21-51-41-400-001-A. LEAK CHECK GOOD. PERFORMED TC 21-000-003 TO C0OMPLETION. NO DEFECTS FOUND.