As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENTRY AREA EMERGENCY EXIT LIGHTS WON'T TEST OR LIGHT UP DURING PREFLIGHT. SUSPECT ESPU BATTERY. FOUND EMERGENCY POWER SUPPLY UNIT WON'T BITE TEST. REPLACED POWER SUPPLY UNIT BATTERY REF A300 AMM 33-51-14-04. EMERGENCY LIGHTS AND POWER SUPPLY UNIT TESTS GOOD SEVERAL TIMES. A/C OK FOR SERVICE.