What was found
(AIRCRAFT NOT GROUNDED) FLIGHT ATTENDANT REPORTS DIRTY SOCK SMELL AT 18,000 FEET IN DECENT. / TC 21-000-001 ACCOMPLISHED, FOUND AND CLEANED OFF OIL AROUND INLET OF APU PLENUM AND EDGE OF INLET SCREEN. RAN BOTH PACK INDIVIDUALLY WITH APU, ENG 1, AND ENG 2 SEPARATELY, UNABLE TO DUPLICATE ODOR. (RESOLVED ON W/O: 525103 TASKCARD: NR-00001 ) C/W TC 21-000-002, NO EXTERNAL LEAKS FOUND, HAVE NOTED A LEAK FROM INLET OF THE APU AT THIS TIME. NO PARTS REPLACED AT THIS TIME. APU REMAINS ON DEFERRAL. C/W TC 21-000-003. APU FCU - FUEL CONTROL UNIT LEAKING. REMOVED AND REPLACED APU FCU (FUEL CONTROL UNIT) IAW AMM 49-32-11-000-003-A, 49-32-11-400-003-A, PASSED LEAK CHECK IAW 49-00-00-710-010.