What was found
BOS/APA - ON LANDING ROLL-OUT, THE COMBINED HYDRAULIC SYSTEM LOW PRESSURE WARNING LIGHT ANNUNCIATED. THE AIRCRAFT WAS STOPPED AND TURNED OFF THE RUNWAY WITHOUT INCIDENT. THE AIRCRAFT WAS TOWED TO THE RAMP. AN INVESTIGATION REVEALED THE TWO BOLTS ON THE FLIGHT POWER SHUT-OFF VALVE HAD FAILED. THIS ALLOWED THE COMBINED HYDRAULIC SYSTEM TO LEAK ALL OF ITS FLUID. THE -1 VALVE WAS REPLACED WITH A 3A VALVE. THE SPILLAGE WAS CLEANED FROM THE AFFECTED AREAS, AND THE SYSTEM HYDRAULIC RESERVOIR REPLENISHED. THE NECESSARY FUNCTIONAL, OPERATIONAL, AND LEAK CHECKS WERE PERFORMED WITH SATISFACTORY RESULTS, AND THE AIRCRAFT WAS RELEASED TO SERVICE. (X)