What was found
IN CRUISE CREW REPORTED SMOKE COMING FROM FLIGHT CONTROL UNIT. NO ECAMS NOTED, SMOKE/AVNCS SMOKE. QRH PROCEDURE APPLIED, EMERGENCY DECLARED. DIVERTED TO OKC & LANDED WITHOUT INCIDENT. PERFORMED INSPECTION OF FWD E&E BAY, MID & AFT E&E BAY, MID LT E&E BAY AND NO DAMAGE FOUND. FOUND FCU HAD SMELL OF BURNED WIRE INSULATION. REMOVED FCU, INSPECTED WIRING FWD TO LT & RT BEHIND LCD'S AND GLARESHIELD, NO DAMAGE FOUND. INSTALLED NEW FLIGHT CONTROL UNIT. PERFORMED LIGHT OPS TEST, TESTED GOOD. PERFORMED OPS TEST OF FLIGHT CONTROL UNIT AND TESTED GOOD. PERFORMED AFS TEST, TEST PASS. PERFORMED OPS LAND, TEST PASS. CLEANED AND STOWED CREW O2 MASKS.