What was found
AMBER XPDR 1 FAIL CAS MESSAGE ILLUM. C/B TRIPPED WITH ODOR OF SMOKE. SMOKE ODOR DISSIPATED WITH BREAKER OFF. T/S FAILED TCAS/XPDR, NO MDC DATA CHECK FOR CODES. XPDR 1 FAIL CAS IS ACTIVE & DID NOT GO OUT CB IN. FOUND TCAS/XPDR 1 CB OUT ON ARRIVAL, RESET CB & WHEN TEST BUTTON PUSHED ON, UNIT NO INDS. DID NOT NOTE BURNING ODOR FROM UNIT OR IN LT EQUIP BAY. CHECKED ENTERTAIN EQUIP & GALLEY EQUIP, PORTABLE MONITORS, LIGHTING, GALLEY EQUIP, & NOTED NO ABNORMAL ODORS/SMOKE, T/S PWR PIN 2 & GRND PIN 3 IAW WO 34-43·00, GOOD PWR & GRND TO UNIT, COOLING FAN FUNCTIONED NORMAL. CHECKED CB & WIRING, NO DEFECTS NOTED. REPLACED NR 1 TCAS/XPDR UNIT. CAS MESSAGE CLEARED, INSTALLED & OPS CHECKED IAW AMM 34-54-01.