What was found
EMERGENCY LIGHT POWER SUPPLY TEST FAILED MESSAGE. EPSU 13WL AFT LEFT. REPLACED THE POWER SUPPLY BATTERY IAW MM 33-51-38, OPS CHECKED GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
EMERGENCY LIGHT POWER SUPPLY TEST FAILED MESSAGE. EPSU 13WL AFT LEFT. REPLACED THE POWER SUPPLY BATTERY IAW MM 33-51-38, OPS CHECKED GOOD.