What was found
WHILE EXPERIENCING DU4,5 &6 INTERMITTENT BLANKING RECIEVED 'BUS R EMER AC OFF' LVL 1 ALERT,THEN 'IRU 2 ON BAT' LVL 1,FINALLY 'IRU2 FAIL' LVL 2 ALERT.LATER RECEIVED 'SELECT FADEC ALTN' LVL 2 ALERT ON ALL ENGINES,'ATC XPNR 1 & 2 'FAIL ALERTS,ETC. DIVERTED CDG PRIOR TO OCEANIC AIRSPACE. PRECAUTIONARY FOR LOSS OF POWER OF RIGHT EMERGENCY AC BUSS, R & R RCCB B1-138, B1-139, R2-18, R2-5157, DU'S 4-5-6, DEU-2, CK S1-281 & ADJUST, B1-139 CHECK GROUNDS AT PINS 5A & 3 PIN 3 VIA CB'S B1-139. INSPECTED BUNDLES AND WIRING. RAN ENGINES 5 MINUETS. ALL TEST OK. TEST FLIGHT WAS PERFORMED FOR ADG FUNCTIONAL TEST. ALL SATISFACTORY. AIRCRAFT RETURNED TO SERVICE.