As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OVERNIGHT MAINTENANCE DISCOVERED EMERGENCY LIGHT TEST FAILING, FAULT (115 VAC AFT L) PRESENT. MAINTENANCE REMOVED AND REPLACED THE LT AFT POWER SUPPLY IAW MM 33-51-38-04. VENDOR CONFIRMED FAULT. UNIT WAS REPAIRED AND TESTED IAW CMM 33-51-09 REV.2