As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT LANDED NORMALLY WITHOUT INCIDENT. DURING POST FLIGHT INSPECTION, THE FIRST OFFICER NOTED THAT THE NR 2 ENG OTBD COWLING COVER WAS MISSING. AT NO POINT DURING THE FLIGHT WERE ANY IRREGULARITIES APPARENT TO THE CREW. INSTALLED MISSING NR 2 ENG OTBD COWL ASSEMBLY IAW ATR 42 IPC 54-22-60 FIG 03 ITEM 70.