As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - EMERGENCY LIGHTS SWITCH ON THE F/A STATION WERE LEFT ON AND DRAINED EMERGENCY LIGHT BATTERIES. REPLACED ALL 4 EMERGENCY LIGHT BATTERY PACKS. ALL FOUR PART NUMBERS OFF ARE P/N 2013-1A AND NR 1 BATTERY PACK S/N 62620, NR 2 IS S/N 83873, NR 3 IS S/N 78392, AND NR 4 IS S/N 67593. (M)