What was found
(CAN) CREW REPORT: DURING THE CLIMB THE NR 1 HYD PUMP CAUTION LIGHT ILLUMINATED. QRH PROCEDURES WERE FOLLOWED RESTORING ALL HYD SYSTEMS. A RETURN TO BASE WAS COMPLETED. MX REPORT: NR1 ENGINE EDP REPLACED IAW AMM 29-11-01. MAIN SYS 1 PRESSURE FILTER REPLACED. CASE DRAIN FILTER REPLACED AFTER LINE FLUSHED OF DEBRIS. NIL FURTHER FILTER ELEMENT DPI EXTENSION AFTER ENGINE GROUND RUN C/O. SYS 1 HYD RESERVOIR SERVICED AND BLEED, DELTA PRESSURE CHECK SATIS. (TC 20100219004)