As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THE A/C PACKS SMELLED LIKE MILDEW. FOUND AFT CARGO DOOR SELECTOR VALVE LEAKING FLUID. EVIDENT AT APU INTAKE. R & R AFT CARGO DOOR MANUAL SELECTOR VALVE IAW AMM 52-36-15. OPS AND LEAK CHECKS PASSED . CLEANED APU INLET IAW AMM 46-16-00. ACCOMPLISHED PACK ECS CHECK IAW 21-00-00. RAN PACK FOR TWO HOURS, NO ODORS PRESENT.