As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1468 - DCA-BDL - EMERGENCY LIGHTS - EMERGENCY LIGHTS TEST FAILS ON WEEKLY CHECK. "EMERGENCY POWER SUPPLY UNIT (EPSU) FORWARD LEFT" ANNUNCIATED. REMOVED AND REPLACED EMERGENCY POWER SUPPLY UNIT 10WL PER AMM 33-51-38. OPERATIONAL CHECK WAS GOOD.