As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CABIN REPORTED SOUNDS OF UNSECURED CARGO, AFT COMPARTMENT(S). INSPECTED AFT & BULK CARGO COMPARTMENT, NO DEFECTS NOTED. RAN ENGINES AND ISOLATED PROBLEM TO BLUE SYSTEM. SUSPECT AIR IN SYSTEM. BLEED BLUE SYSTEM IAW AMM 29-00-00-875A. OK FOR SERVICE.