What was found
RETURN TO GATE EVENT-DURING T/O, AFT CARGO DOOR INDICATED NOT CLOSED. T/O WAS ABORTED. INSPECTED AFT CARGO DOOR IAW A320 TSM 52-32-00-810-801-A & A320 AMM 52-71-00-820-004-A. IMMEDIATELY NOTICED AFT CARGO DOOR HANDLE NOT FULLY LOCKED/LATCHED. LATCHED DOOR, INDICATION EXSTINGUISHED. ALL DOOR COMPONENTS ARE SOUND. MCC NOTIFIED. A/C OK FOR SVC. (LP: 8241362, AIRCRAFT WAS GROUNDED)