What was found
IAH - FLIGHT 4258 THE CREW REPORTED A BAD SMELL DURING DESCENT LIKE AN "OLD GYM SOCK" VERY STRONG, VERY PROMINENT. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT WHERE MAINTENANCE INSPECTED THE AIRCRAFT AND PLACED THE NR 1 PACK ON MEL 21-51-00-3, AND THE AIRCRATF WAS APPROVED FOR RETURN TO SERVICE. ***THIS SDR FILED OPEN PENDING FINAL REPAIR*** *** SUPPLEMENTAL ***N 10/19/18 IAH MAINTENANCE OPERATIONALLY TESTED THE NR 1 PACK SYSTEM IAW AMM WITH NO SMELL OR ABNORMALITIES NOTED. THE MEL WAS REMOVED AND THE AIRCRAFT APPROVED FOR RTEURN TO SERVICE. THIS SDR IS NOW CLOSED.