As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT NOISE AT LT NR 4 DOOR. EMER DECLARED FLIGHT RETURNED & LANDED WITHOUT INCIDENT. FOUND GIRT BAR STRAP MIGRATED INTO AIRSTREAM. SECURED STRAP & ACCOMPLISHED PRESSURIZATION OF ACFT WITH NO FAULTS NOTED. SYS GND CHECKED NORMAL OPERATION CLOSED.