As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS - DURING OVERNIGHT MAINTENANCE, THE EMERGENCY LIGHT BATTERY AT LEFT CABIN FAILED TEST PER T/C I8M05319 (CIDS PANEL CK). MAINTENANCE REPLACED THE BATTERY PACK FOR THE LEFT CABIN EMERGENCY LIGHT PACK. OPS CHECK GOOD PER T/C I8M05319.