What was found
DURING CLIMBOUT, PASSING 14000 FT, RECEIVED A LT FWD CABIN NOT CLOSED ECAM WITH ASSOCIATED DOOR WARNING HORN. PRESSURE WAS NORMAL. VIEWING LOCK WINDOWS ON DOOR SHOWED PARTIAL RED, AIR TURN BACK ACCOMPLISHED. AT BLOCK IN HANDLE WASN'T FULLY SEATED. INSPECTED DOOR LOCKING IAW AMM 52-10-20. NO FAULTS FOUND. PERFORMED DOOR WARNING TEST IAW AMM 52-70-00. ALL TESTS PASSED.