What was found
INFLIGHT AT FL 320 DEU'S 4 - 6 & MCDU 2 WENT BLANK & IMMEDIATELY GOT LEVEL 1 BUSS RT EMERGENCY AC OFF ALERT. ALSO OFF LIGHT RT EMERGENCY AC ON OVERHEAD & ELECTRICAL DISPLAY, MANY ASSOCIATED ALERTS, SELECT FADEC ALTERNATE, SINGLE LAND, ATC TRANSPONDER 2 FAIL, GPWS FAULT, IRU 2 ON BATTERY, PITOT HEAT FO, INDEPENDENT OPERATION ON MCDU, NO COMPARE ON PFD, TANK 2L AFT PUMP LOW. DUMPED 25K FUEL. INTERROGATED EPCU & FOUND REAC SENSE RELAY & INTERFACE UNDER CURRENT FAULTS. R & R RT EMERGENCY SENSE RELAY, R2-5157, IAW MM 24-25-01-00. ALL LISTED FAULTS CLEARED IAW FIM 24-25-01-00. REPLACED THE RT EMERGENCY AC BUSS FEED RCCB. RAN ALL ENGINES IAW JRH, TOOK APU & EXTERNAL POWER OFF LINE. ACFT OPERATES NORMAL. ACFT OK FOR SERVICE.