What was found
DURING CLIMB OUT PASSING FL 270, RECEIVED A ECAM ALERT FOR FWD CARGO DOOR UNLOCKED, WITH CORRESPONDING INCREASING CABIN ALTITUDE. COMPLIED WITH QRH, DURING DESCENT TO MINIMUM VECTOR ALTITUDE AT 17000FT, ECAM ALERT WENT OUT FLICKERED ON AND OFF THREE OR MORE TIMES. DOOR PAGE SHOWED ALL DOORS CLOSED AND LOCKED. REMOVED AND REPLACED FWD CARGO DOOR HANDLE WARNING SWITCH 16WS IAW A300 AMM 52-71-11. CHECKED ADJUSTMENT USING ALTERNATE METHODS SPECIFIE IAW AMM 52-71- 11-05-01. ALL OPS GOOD AT THIS TIME.