As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN THE EMERGENCY EXIT LIGHT SWITCH IN OVERHEAD WAS PUT IN ARM POSITION THE LIGHTS CAME ON. MAINTENANCE FOUND A SHORTED POWER WIRE AT EMERGENCY LIGHT BATTERY PACK(M9100) STA 378, REFERENCE WDM 33-51-01. REPAIRED WIRE AND EMERGENCY LIGHT OPERATION CHECKED GOOD.