As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT SIDE COWLING CAME LOOSE IN FLIGHT. AIRCRAFT RETURNED TO DEPARTURE AIRPORT. COWLING REMAINED ATTACHED TO THE NACELLE. MAINTENANCE VISUALLY INSPECTED RT COWLING AND FOUND INBOARD COWLING LATCH FAILED. MAINTENANCE REMOVED AND REPLACED THE COWLING LATCH ASSEMBLY.