As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME EVENT. PACK OFF(APU BLEED ON) REQUIRED FOR T.O. AFTER DEPARTURE WHEN BLEED AIR WAS TRANSFERED FROM APU TO ENG A DIRTY SOCK SMELL WAS OBSERVED. PACK 1 WAS ISOLATED AND TURNED OFF. POSSIBLE ASSOCIATION WITH RAIN. FOUND THAT FUME EVENT WAS ISOLATED TO PACK 1 IAW TSM 05-50-00-810-831-A.