What was found
FWD FA INTERPHONE EMERGENCY LIGHT SLIGHTLY ILLUMINATED. SLAVED IN NEW ATTENDANT HANDSET. NO FIX. REINSTALLED ORIGINAL HANDSET BACK. SWAPPED FORWARD AND AFT HANDSETS, NO FIX. SLAVED IN AN ICU PANEL, NO FIX. ORIGINAL PLACED BACK IN. SLAVED IN A PA AMPLIFIER, NO FIX. ORIGINAL PLACED BACK IN. SLAVED IN APU GCU, NO FIX. ORIGINAL PLACED BACK IN. REMOVED AND REPLACED THE LAVATORY ATTENDANT CALL SWITCH PC BOARD, NO FIX. THIS ONLY OCCURS WHEN SHED BUS 1 AND 2 ARE OFF (AUTO MODE) EICAS MESSAGE IS PRESENT WITH BATTERIES OR APU GENERATOR. DOES NOT OCCUR WITH GPU SELECTED OR SHED BUS IS IN OVERRIDE.REMOVED ATTENDANT CALL PANEL ASSEMBLY. INSTALLED AFT ATTENDANT CALL PANEL ASSEMBLY. OPS CHECK GOOD.