What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO DFW. ON TAKE OFF, FORWARD CARGO DOOR INDICATED OPEN ALONG WITH ECAM WARNING. THE AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT. MAINTENANCE PERFORMED FIM 52-31-00-810-801-A AND WHILE OPENING THE FORWARD CARGO DOOR A LARGE CHUNK OF DEBRIS, A SUITCASE ROLLER BOARD WHEEL FELL OUT ONTO THE RAMP. MAINTENANCE CLOSED THE DOOR AND THE DOOR INDICATED PROPERLY.