As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT UPPER ENGINE COWL DEPARTED AIRCRAFT DURING LANDING ROLL AT DCA. MAINTENANCE INSPECTED AIRCRAFT, REPLACED UPPER NOSE COWL ACCESS PANEL ON LEFT ENGINE, REMOVED AND REPLACED LOWER NOSE COWL ACCESS PANEL ON LEFT ENGINE AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT WAS RELEASED FOR SERVICE.