What was found
(CAN) FOLLOWING A YELLOW HYDRAULIC SYSTEM FAILURE, THE AIRCRAFT SUBSEQUENTLY EXPERIENCED A GREEN HYDRAULIC SYSTEM FAILURE, AND DIVERTED BACK TO DEPARTURE POINT. THE FLIGHT DECLARED AN EMERGENCY, AND LANDED 4000 KG OVERWEIGHT. AFTER LANDING, A NR 1 AND 3 BRAKE FIRE WAS ENCOUNTERED, WHICH WAS EXTINGUISHED BY CFR. THE AIRCRAFT WAS TOWED TO THE HANGAR. THE YELLOW SYSTEM WAS WORKED ON THE 18TH, AND A CHECK VALVE PACKING WAS REPLACED FOLLOWING AN INFLIGHT PRESSURE LOSS. (TC NR 20070924006)