As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROGH 4000FT OUT OF FLL WE GOT MUSTY/MOLDY SMELL. WENT AWAY CLIMBING THROGH ABOUT 8000FT DESCENDING INTO ATL WE GOT THE SAME SMELL THROGH 13000FT TURNED OFF PACK1 AND THE SMELL WENT AWAY. GOT TO THE GATE TURNED ON PACK AND THE SMELL CAME BACK MORE OFANALY.-PER TSM 05-50-810-831-A STEP 4A PERFORMED INSP OF APU IAW AMM 49-00-00, NO DEFECTS NOTED NO SMELL/ODOR DETECTED. A/C OK FOR SVC.