What was found
(CAN) DURING CRUISE, CREW NOTED AN IDG NR 1 FAULT MESSAGE, FOLLOWED BY OIL PRESSURE FLUCTUATIONS, OIL PRESSURE WARNING. THE ENGINE WAS SHUT DOWN AND THE AIRCRAFT MADE AN UNEVENTFUL SINGLE ENGINE LANDING. MAINTENANCE INVSTIGATION SUGGEST THAT IDG DISCONNECT DID NOT ACTIVE. IDG, ACCESSARY GEAR BOX AND LUBE/SCAVENGE PUMP WERE REMOVED AND REPLACED. OIL FILTER AND OIL SAMPLE WERE SENT FOR ANALYSIS.AIRCRAFT HAS RETURNED IN SERVICE.