What was found
PDIS 595 24-40 5629 19MAR22 ANC FACT U ON SHUTDOWN, WHILE TRANSFERRING TO EXTERNAL POWER, DEU 3,4,AND 5 WENT BLANK, MCDU 2 AND 3 WENT BLANK CIRCUIT BREAKERS STANDBY ALTIMETER VIBRATOR, AVIONICS COMPARTMENT EXHAUST FAN, CAC FAN 1,2, AND 3, AVIONICS RACK FAN 2, AND AVIONICS COMPARTMENT COOLING FAN ALL POPPED. WE SMELLED SMOKE AND REMOVED ALL POWER FROM AIRCRAFT. FACT 19MAR22 22:31 ANC U REPLACED EXTERNAL POWER RELAY REF M/M 24-41-01-4.