What was found
STRANGE ODOR OF DIRTY SOCKS COMING FROM PACKS WHILE RUNNING ON APU BLEED. SECURED RISER DUCT AT SEAT 9BC IAW AMM 21-20-04 . REMOVED AND REPLACED THE LT CONDENSER MIXER IAW AMM 21-51-04. OPS CHECKED GOOD. LEAK CHECKED GOOD. NO FURTHER DEFECTS NOTED. REMOVED AND REPLACED THE LT HEAT EXCHANGER IAW AMM 21-51-02. OPS AND LEAK CHECKED GOOD. REINSTALLED LT ACM IAW AMM 21-51-03. OPS AND LEAK CHECKED GOOD. C/W EO EM-2100-048 PART A. OPS AND LEAK CHECKED GOOD. REMOVED AND REPLACED THE RECIRCULATION MUFFLER DUCT IAW AMM 21-24-02. REMOVED AND REPLACED Y-DUCT ON LT PACK IAW AMM 21-60-01. OPS AND LEAK CHECKED GOOD. NO FURTHER DEFECTS NOTED.