What was found
PHX - LANDING GEAR - FLT 283 - CREW REPORTED THAT THE LEFT LANDING GEAR "UNLK" INDICATION ILLUMINATED, IN-FLIGHT WITH LANDING GEAR UP, FOR APPROX 5 SECONDS. THEN THE INDICATION EXTINGUISHED. REPORTED THAT ALL OTHER LANDING GEAR AND HYDRAULIC INDICATIONS, ON FORWARD PANEL AND ON ECAM, WERE NORMAL. MAINTENANCE REPORTED THAT THE AIRCRAFT IS NOT PICKING UP ANY FAULTS. CHECKED WIRING FROM LGCIU1 AND LIGHT BOARD, 9LP. ALSO CHECKED WIRING BETWEEN 9LP TO THE INDICATOR. OPERATIONAL CHECKS WERE GOOD. REMOVED AND REPLACED THE LT INDICATOR, 10GB, IAW AIRBUS ASM 32-61-00 SCH 01. OPERATIONAL TESTS WERE GOOD.