What was found
DURING LINE MAINTENANCE, THE EMERGENCY LIGHTS TEST FAILS THE AFT LEFT POWER SUPPLY UNIT. REPLACED EPSU, OPERATIONAL CHECK OK.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING LINE MAINTENANCE, THE EMERGENCY LIGHTS TEST FAILS THE AFT LEFT POWER SUPPLY UNIT. REPLACED EPSU, OPERATIONAL CHECK OK.