As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT ATTENDENTS REPORT BANGING NOISE FROM BACK OF AIRCRAFT - PERFORMED FIM 49-55 TASK 809 NO DEFECTS NOTED PERFORMED APU BITE PER FIM 49-60 TASK 801 NO FAULTS NOTED PERFORMED INPUT MONITORING OF BLEED AIR SYSTEM OPS CHECKS NORMAL OK SERVICE