What was found
FUME /DIRTY SOCK SMELL ON T/O DISSIPATED QUICKLY RETURNED ON FINAL APPROACH. PERFORMED A220 NO GO ODI PREVENTION ATA 2172-SMOKE /FUMES IN THE CABIN PERFORMED STEP 1 :AMDS WORKCARD 0550-2001 STILL REQUIRES STEP 12 TO BE COMPLETED .FOUND SOURCE OF SMELL COMING FROM LEFT ENG BLEED SOURCE. PERFORMED AMDS WORKCARD 0550-6001UP TO STEP 6B. (JR 856279). C/W W/C 0550-6001 REPAIR ENG SOURCE. C/W W/C 0550-2001 ISOLATE SMOKE AND FUMES AND C/W W/C ECS DECONTAMINATION POST SMOKE AND FUME. ALL WORK CARDS COMPLETED. NO FURTHER DEFECTS NOTED. A/C OK FOR SVC. (LP# 6562826)