What was found
LP481556 ITEM 2 / ON DECENT INTO MCO FA'S CALLED AND SAID THEY SMELLED DIRTY SOCKS. I TURNED PACK TWO OFF BUT THEY SAID NO CHANGE TO THE SMELL WE NEVER SMELLED ANYTHING IN THE COCKPIT. AIRCRAFT WAS GROUNDED AS A RESULT OF THIS EVENT. CORRECTIVE ACTION: PERFORMED LEVEL C REMOVAL OF THE CONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM IAW AMM 21-00-00-615-804-A NO CONTAMINATION FOUND A/C OK FOR SERVICE/END//