As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PASSENGER INFORMED CREW THAT SMALL SKIN PATCH WAS LOOSE ON TAXI-OUT AND DEPARTED THE AIRCRAFT IN FLIGHT. PASSENGER ADVISED F/A AFTER TAKE-OFF AND EXTRA CREW MEMBER CONFIRMED MISSING PANEL. MAINTENANCE INSTALLED NEW PANEL USED ALT PARTS FOR BRACKET AS41090C AND BOLTBACB30VF3F3 PER EA 366393