What was found
OPERATIONAL CHECK OF CABIN EMERGENCY LIGHTS {A3NB-33-3-6012} - SHOWS EPSU BATTERY AFT L UPON CIDS PTP CHECK IAW TSM TASK 33-51-00-810-802-A, ACP OPERATIONAL TEST OF THE 33-51-38-000-002-A AND TASK 33-51-38-400-002-A. EPSU BITE CHECKS EMERGENCY LIGHTS NOT WITH THE CABIN INTERCOMMUNICATION DATA OKAY, CIDS PTP BITE CHECK OKAY. PARTS USED: SYSTEM (CIDS) REF AMM TASK 33-51-00-710-006-A FOR 13WL. SHOWED 18-3351-3-0001,QTY :1 BATTERY FAULT. REPLACED EPSU BATTERY IAW AMM TASK IDT C/W EPSU BATTERY FOR PROPER INSTALL, SECURITY, AND OPS. REF GMM 09-10-05