http://www.gpiaa.gov.pt/tempfiles/20...42318moptc.pdf
The relevant sentence, courtesy of Google Translate, reads...
the control tower informed the crew that the door of the front cargo hold is found open, which was confirmed by the indications in the cockpit (MACE).
Not surprisingly the last sentence reads...
the event was classified as a serious incident and the Director of GPIAA determined the opening of an investigation of an incident.