As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A ATB FOR LOUD NOISE AND MCD DOOR EICAS WARNING IND DURING T/O LIGHT ILLUMINATED AT MAIN STRUT EXTENSION ON T/O ACCOMPANIED FROM A THUMP FROM THE CARGO AREA. DECLARED EMERGENCY AND RETURNED. ON DOWN WIND THE LIGHT EXTINGUISHED. TROUBLE SHOT MAIN CARGO DOOR TO A DEFECTIVE PRIORITY VALVE (PV2) AS PER B757 MM 52-32-00. PERFORMED OPS CHECK AND LEAK CHECK OF MCD SYSTEM AS PER MM 52-32-00 SYSTEMS CHECK OK.