What was found
(CAN) THE CREW OF OVERSHOT RUNWAY DUE TO AN UNSPECIFIED PROBLEM. THE CREW ADVISED THATERS WAS NOT REQUIRED AND LANDED 20 MINUTES LATER WITHOUT INCIDENT. NO OPERATION AL IMPACT. ENTRY FROM MAINTENANCE OPS SUMMARY DURING GEAR EXTENSION CREW REPORTED THEY HAD A YELLOW GEAR DOOR LIGHT AND PRESSURE DROPPED TO ZERO. CREW ELECTED TO CARRY OUT ALTERNATE GEAR EXTENSION AND NOTICED NR 2 EDP CAUTION LIGHT ILLUMINATED J/L NR 2 DEFECT 414058 LANDING GEAR WOULD NOT EXTEND NORMALLY AMBER DOOR LIGHTS AND A LOUD GRINDING NOISE. NO NR 2 STANDBY OR MAIN PRESS. COMPLETED EMERG. CHKLIST & ALT GEAR EXT.RECTIFICATION REPLACED NR 2 ENGINE DRIVEN HYD PUMP DUETO SHAFT SPLINE WEAR. A/C GRD RAN, HYDRAULICS FUNCTIONED & LEAK CHECKED.