As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON TAKEOFF TILL ABOUT 5000 FEET THERE IS A MUSTY DIRTY SOCK ODOR IN THE FLIGHT DECK AND CABIN. SMELL CLEARS UNTIL DESCENDING BACK THROUGH ABOUT 5000 FEET. THEN ODOR RETURNED TILL LANDING. ACCOMPLISHED SOF J/C 08L00021001, FOUND LEFT PACK SECONDARY HEAT EXCHANGER CRACKED. REMOVE AND REPLACED LEFT SECONDARY HEAT EXCHANGER. PER J/C 08L13121001, PURGE AIR FROM AIR CONDITIONING DUCTS, NO ADDTIONAL ODORS NOTED.