What was found
AIRCRAFT WAS GROUNDED. AT IDLE/LOW POWER DURING DESCENT IN AIRPORT AREA, DIRTY SOCK SMELL STRONG IN COCKPIT. ODOR NOT DETECTED IN CABIN. PERSISTED TO GATE. ACCOMPLISHED JOB CARD 26L00021001. SUPPLEMENTAL INFORMATION: REMOVED AND REPLACED APU GENERATOR AND PERFORMED J/C 26L00021002 AND 26L0021004.