As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY POWER SUPPLY UNIT FAILED OPERATIONAL CHECK OF CABIN EMERGENCY LIGHTS. REMOVED AND REPLACED EMERGENCY POWER SUPPLY UNIT IAW AMM TASK 33-51-38-000-001-A0 & TASK 33-51-38-400-001-A. PERFORMED CABIN EMERGENCY LIGHTS TEST. OPS CHECK GOOD.PARTS USED: 31-3350-9-9001, QTY :1 ROTABLE PARTS CHG:TT # 1559446 SN OFF 4161 PN OFF 31-3350-9-9001.POWER SUPPLY, P OFF 31-3350-9-9001 4161 ON 31-3350-9-9001 1064