As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, CREW CHIEF HEARD A CLAPPING NOISE FROM OUTSIDE THE ACFT. SUSPECTED THAT A PANEL WAS LOOSE AND SLAPPING AGAINST THE ACFT. SLOWED THE ACFT DOWN TILL THE NOISE STOPPED AND CONTINUED LANDING AT OUR NEXT STOP. AFTER LANDING CREW CHIEF DID A VISUAL INSPECTION AND FOUND THAT ONE OF THE MX PANELS HAD BEEN PUSHED IN. REMOVED AND REPLACED ACCESS PANEL.