What was found
FLIGHT ATTENDANT REPORTED LOUD CRACK FROM THE R4 DOOR. LUBRICATED THE R4 DOOR IAW MM 12-22-52, OPERATIONAL CHECKED NORMAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
FLIGHT ATTENDANT REPORTED LOUD CRACK FROM THE R4 DOOR. LUBRICATED THE R4 DOOR IAW MM 12-22-52, OPERATIONAL CHECKED NORMAL.