What was found
PASSING APPROX 10,000 FT ON DEPARTURE, GOT SC AND ECAM WARNING FOR L1 DOOR UNSAFE. AFTER LEVELING OFF AND FOLLOWING ECAM PROCEDURE TO DEPRESSURIZE, FIRST OFFICER CHECKED THE DOOR WHICH INDICATED UNSAFE. UNEVENTFUL RETURN TO CDG. DESCENDING TO 4,000 FT WITH THE AIRCRAFT DEPRESSURIZED, L1 UNSAFE INDICATION AND ECAM WENT. FOUND LT DOOR HANDLE LOOSE. ADJ/TEST PERFORMED AS PER AMM:52-10-20-5. A/C RELEASED FOR SERVICE.