What was found
EPSU 11WL DEFECTIVE, MULTIPLE SEAT ROWS WILL NOT LIGHT. REMOVED EPSU 11WL IAW AMM 33-51-38-000-001-A, REMOVED BATTERY FORM EPSU 11WL IAW AMM 33-51-000-002-A, INSTALLED BATTERY ON REPLACEMENT ESPU 11WL IAW AMM 33-51-38-400-002-A AMD INSTALLED EPSU 11WL IAW AMM 33-51-38-400-001-A. OPS CHECK C/W CUSTOMER CARD 17-3351-1-7907 SEQ 434 ROTABLE PARTS CHANGE WAS INDICATED - TT 1248208 SN OFF 3612 POWER SUPPLY, C OFF 31-3350-9-9001 3612 ON 31-3350-9-9001 8190.