As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERGENCY LIGHTS OPERATIONAL CHECK: - EEL TEST FAILS EPSU UNIT FWD L. REPLACED EEL POWER SUPPLY UNIT FWD LEFT 10WL IAW AMM 33-51-38-400-001-AO, ALSO REPLACED BATTERY PACK FWD LEFT IAW AMM 33-51-38-400-002-AO. RETESTED OPS. TEST GOOD. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1113668 SN OFF 8313 POWER SUPPLY, C OFF 31-3350-9-9001 8313 ON 31-3350-9-9001 8571