As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS - EEL - LOG# 7779890 - EMERGENCY EXIT LIGHTS RAN DOWN THEIR BATTERIES. EMERGENCY LIGHT SWITCH WAS LEFT ON AND A/C POWER WAS LOST WHEN JET BRIDGE WAS MOVED. MX REMOVED AND REPLACED ALL FOUR EMERGENCY LIGHT POWER SUPPLY BATTERIES IAW T/C A1C33302.