What was found
PHX - EEL - "C" - DURING PREFLIGHT CHECK ROWS 1 THROUGH 5 EMERGENCY LIGHTS REMAINED ILLUMINATED. REMOVED AND REPLACED BATTERY PACK AND POWER SUPPLY, OPERATIONAL CHECK GOOD. PART NAME: BATTERY PACK, MFG: IDD AEROSPACE, P/N: 9008-3-5A, COND.: PARTIALLY DISCHARGED, LOCATION: CABIN.