What was found
AIRCRAFT WAS GROUNDED: PERFORMED APU BLEED ON TAKEOFF DUE TO ENGINE 2 BLEED BEING ON MEL. AFTER TAKEOFF WHEN TRANSITIONING FROM APU BLEED TO ENGINE ONE BLEED A STRONG DIRTY SOCK/SOUR SMELL WAS NOTICEABLE IN FLIGHT DECK. UNABLE TO IDENTITY SOURCE OF SMELL. **SUPPLEMENTAL REPORT FOR AALA202408165260: MAINTENANCE ACCOMPLISHED A CLEANING OF THE APU COMPARTMENT AND THE APU INLET ALONG WITH PERFORMING A DECONTAMINATION OF THE ENVIRONMENTAL CONTROL SYSTEM PER TASK CARDS 26L00021002, 26L00021014.. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED. (CLOSED)