As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS GO OUT AFTER A FEW SECONDS OF BEING TURNED ON. REMOVED AND REPLACED ALL FOUR EMERGENCY POWER SUPPLY UNITS. OPS CHECK GOOD. #1 P/N 2013-1A S/N 99189, #2 P/N 2013-1A S/N 125186, #3 P/N 2013-1A S/N 122970, #4 P/N AD2013-1A S/N 97199.