What was found
(CAN) DEFECT-1102548 NR 1 ENGINE DRIVEN HYD LIGHT ON CONFIRMED THAT THE NR 1 HYD PRESSURE WAS GOOD EVEN WITH SPU`S SELECTED OFF. PRESSURE WAS GOOD. DEFERRED THE CAUTION LIGHT. ONCE AIRBORNE FLT CREW REPORTS THAT THEY HAD NO NR 1 SYS PRESSURE AND THEY WERE RETURNING. CONFIRMED NOT JUST A GAUGE PROBLEM AND CAUTION LIGHT PROBLEM DUE TO NUMEROUS CAUTION LIGHTS ASSOCIATED TO LOSS OF NR 1 MAIN PRESSURE. ENG HYD PUMP CAUTION LIGHT, RESOLVED ON W/O: 374396, TASKCARD: NR-00001, NR 1 ENGINE DRIVEN HYDRAULIC PUMP REMOVED AND INSPECTED. PUMP DRIVE SHAFT FOUND SHEARED.