As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOUD BANG IN CABIN, RTFL. PER MM AND CG SUPERVISOR CANS FOUND NOT SECURE IN FWD CARGO PIT CAUSING "BANG". DUE TO VIBRATION HISTORY REMOVED CARGO CEILING AND SIDEWALL PANELS LOCATED UNDERNEATH SEATS 2K AND 6K. NO DEFECTS NOTED. FOUND LARGE PANEL LOCATED BEHIND SEAT AND CURTAIN MISSING ALL FASTENERS. PANEL WAS ONLY SECURED BY VELCRO STRIP. REPLACED 8EA MISSING PLASTIC RIVETS PART 27SR0030.