What was found
(CAN) CLIMBING THOUGH FL80 FROM COPENHAGEN, 1ST OFFICER REPORTED LOSS OF NR 2 HYDRAULIC SYSTEM CONTENTS. AIRCRAFT RETURNED TO COPENHAGEN, CARRYING OUT ACTION IAW EMERGENCY CHECKLIST NR 2 HYDRAULIC SYSTEM FLUID LOSS. AIRCRAFT STATICS: TOTAL HOURS 4532.10 TOTAL CYCLES 4601REF/ASR050/00/DH8 ENGINE INSPECTION FOUND HYDRAULIC PRESSURE LINE FRACTURED, PIPE ASSEMBLY REPLACED AND LEAK CHECK CARRIED OUT SATISFACTORY. DURING ENGINE RUN, HYDRAULIC NR 2 SYSTEM DEPLETED AND ILLUMINATION OF CAUTION LIGHTS & NR 2 SPU CCT BKR POPPED, MAINTENANCE FOUND LEAK FROM NR 2 SPU CASE DRAINCASE, SPU REPLACED & NR 2 CASE DRAIN FILTER REPLACED & NR 2 ENGINE DRIVEN PUMP REPLACED IAW DHC-8 AMM 5-50-33 DUE