As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PREFORMING TASK 33-51-00-710-001-A (OPERATIONAL CHECK OF EMERGENCY POWER SUPPLY UNITS BY BITE-CHECK) RECIVED EPSU (11WL) FAULT MESSAGE DURRING OPS CHECK. / REMOVED AND REPLACED FWD AND AFT OVERWING EMERGENCY LIGHTS IAW AMM 33-51-15 OP CHECK GOOD AT THIS TIME."