What was found
(AIRCRAFT NOT GROUNDED) DIRTY SOCK ODOR DETECTED BY ALL 4 FLIGHT ATTENDANTS FROM ROW 23 TO AFT GALLEY. ODOR DISSIPATED AFTER 5-10 MINUTES. / C/W PHASE 1 OIL TYPE SMELL REF TC 21-000-001 GVI OF APU AND APU COMPARTMENT SHOWED NO EVIDENCE OF AN OIL LEAK. COULD NOT REPRODUCE DIRTY SOCK ODOR ON PAK 1 OR 2 WITH APU AS BLEED SOURCE. COULD NOT REPRODUCE ODOR ON PACK 1 OR 2 WITH ENGINES AS BLEED SOURCE.COMPLIED WITH TASK CARD 21-000-002 FOR OIL TYPE SMELL. COULD NOT DUPLICATE ODOR. NO LEAKS NOTED DURING APU OPERATIONS.