What was found
(CAN) ON PASSING APPROXIMATELY 12000 FT ON CLIMB TO CLEARED LEVEL OF FL220, 1 HYD FLUID HOT, CAUTION LIGHT ILLUMINATED. QRH CONSULTED, APPROXIMATELY 5 MINUTES LATER, THE 1 ENG HYD PUMP, FOLLOWED BY NR 1 HYD ISO VALVE, ELEVATOR PRESS AND HYDRAULIC SHUTOFF VALVE CLOSED ADVISORY LIGHT ILLUMINATED. IAW NR 1 ENG HYD PUMP, CAUTION LIGHT QRH CHECKLIST, THE STBY HYD PRESS WAS TURNED ON. NR 1 SYS PRESSURE WAS REINSTATED AT APPROXIMATELY 3000 PSI AND ALL CAUTION LIGHT EXCEPT NR 1 ENG HYD PUMP CAUTION LIGHTS WERE EXTINGUISHED. APPROXIMATELY 2-3 MINUTES LATER, THE NR 1 SYS QTY GAUGE WAS OBSERVED BY BOTH TECH CREW TO FALL TO ZERO. NR 1 HYDRAULIC PUMP FOUND TO BE THE CAUSE OF THE FAILURE WITH SOME INTERNAL MECHANICAL FAILURE. CASE SHOWS SIGNS OF CRACKING.