What was found
L1 CABIN DOOR UNLOCKED ECAM, CLIMBING THROUGH FL310, COMPLETED CHECKLIST, PRESSURIZATION NORMAL, DOOR HANDLE DOWN LOCKING, DOOR INDICATOR SHOWS UNLOCKED. DECENDED TO 15,000 FT, ECAM CLEARED TO NORMAL. REMOVED AND REPLACED THE UPPER LEFT GUIDE ROLLER, PERFORMED A PRESSURIZATION UP TO 5 PSI, DOOR OPS CHECKED NORMAL, NO DEFECT NOTED, OK TO CONTINUE IAW AMM 52-70-00-0501.