What was found
MMSG {33-11412} *CLASS 12-DOOR 2 LH FWD GI BIN RMT WELS CON TROL UNT BATTERY POWER IS FAILED* INTERMITTENTLY. CONSULT FIM DM C-B787-A-33-50-F1-79A-421A-A TO EVALUATE THE MAINTENANCE MESSAGE. NOTE: WCU-GI LIGHT-BIN_ZONE 1 AFT (M3351072) (CLASS12) APPEARS TO BE LOCATED ABOVE SEAT 8D, AS DEPICTED IN 787-9 NEW DELIVERY EMERGENCY ESCAPE PATH LIGHTING SYSTEM-CONFIGURATION DRAWING 2500 DD15996_B-SHEET 3. PART INCLUDED AS PRECAUTIONAL. R & R WBU #12 IAW AMM 33-51-07. R & R WBCU #12 REF AMM 33-51-07. INSTALLED 33 ELS SOFTWARE DB/OPS. NETWORK FULLY FORMED WITH NEW SERIAL NUMBERS. PERFORMED GROUND TEST 33 EMERGENCY LIGHTING SYSTEM TEST REF AMM 33-51-00, TEST PASSED. NO FAULTS. OPS TEST NORMAL