As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O LOUD NOISE COMING FROM NOSE AREA, SUSPECTED EXTERNAL ACCESS PANEL LEFT OPEN. EMERGENCY DECLARED, A/C RETURNED BACK TO IAH AND LANDED SAFELY. INSPECTED A/C AND FOUND EXT PWR RECEPTACLE DOOR OPEN. INSPECTED DOOR NO DEFECTS NOTED, CLOSED DOOR.