As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT RECEIVED REPORT FROM PASSENGER THAT PART OF THE LT ENG COWL MAY HAVE BLOWN OFF. PILOT CONTINUED TO DESTINATION AND LANDED WITH NO FURTHER INCIDENT. UPON IMMEDIATE WALK AROUND FOUND THAT LT ENG OB COWLING PANEL WAS MISSING AND HAD DEPARTED AIRCRAFT IN FLIGHT. INSTALLED NEW TOP CENTER COWL/FABRICATED P/N 118-910028-3 AND 129-910043-601.