As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED OF FLIGHT DUE TO DURIG CLIMB, THE AICRAFT CARGO COMPARTEMENT LIGHT TURNED ON, MAITENANCE PERSONNEL PERFORMED REVISION TO AFT CARGO COMPARMENT DOOR MECHANISM, DETECTING THAT THE LANYARD USED TO CLOSE THE DOOR BECOMES STUCK WITH THE SWITCH OF THE DOOR, CAUSING THAT WAS NOT CLOSED PROPERLY AN WHEN PESSURIZING THE AIRCRAFT WAS NOT DONE CORRECTLY, THE PROXIMITY SWITCH AND THE PESSURIZATION CONTROLLERS WERE TESTED AND AFT CARGO COMPARTMENT DECOMPRESSION PANELS WERE REVIEW, NOT CONFIRMING FAILURE.