What was found
(CAN) CAPTAIN STATED ALL PHASES OF THE FLIGHT WERE NORMAL, BOTH GENERATOR 1 & 2 ON LINE, BUT PASSING 11000 FT ON DESCENT, THE NR 1 IDG WENT OFFLINE AND THE ADG AUTO DEPLOYED. FOLLOWED QRH AND STARTED THE APU AND POWER RETURNED. THE NR 2 GENERATOR APPARENTLY DID NOT PICK UP THE LOAD. IT IS NOT CLEAR IF THE NR 2 GENERATOR REMAINED ON LINE OR SHED. THE FOLLOWING PARTS HAVE BEEN REPLACED: 3 GCUS, AND CIRCUIT CARD.