What was found
FOLLOW UP FROM SDR DATED 27-FEB-24: CREW REPORTED #1, 2 & 3 DISPLAY SCREENS WENT BLANK IN FLIGHT, FGC A FAIL WITH SMOKE IN THE CABIN. THE FOLLOWING CB'S POPPED DURING THE EVENT, GPWS, FADEC 1 & 2 A CHANNELS & FLAP CONTROL. REPLACED NO. 1 GENERATOR CONTROL UNIT (GCU) P/N 9914752-7EX S/N 256M WITH OVERHAULED UNIT P/N 9914752-6 (92746-3) S/N 311-M. PERFORMED SATISFACTORY MAINTENANCE CHECK FLIGHT.