As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT INSPECTION THE EMERGENCY LIGHTS WERE NOT COMING ON AND THE EMERGENCY SWITCH ON THE FA'S PANEL WAS FOUND IN THE ON POSITION. SUSPECT THE BATTERIES ARE DEAD. PERFORMED AN OPS TEST OF THE EMERGENCY POWER UNIT IAW AMM 33-51-7. OPS CHECK PASSED. NO FURTHER DEFECTS NOTED AT THIS TIME.