As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON GEAR EXTENSION, NR 2 ENGINE HYDRAULIC PUMP CAUTION LIGHT ILLUMINATED. NR 2 MAIN HYDRAULIC INDICATION WENT TO ZERO PSI. AFTER GEAR DOWN, PRESSURE RETURNED TO 3000 PSI. CAUTION LIGHT REMAINED ILLUMINATED. NR 2 SYSTEM QUANTITY REMAINED AT 4 QTS. REMOVED AND REPLACED NR 2 ENGINE DRIVEN HYDRAULIC PUMP AND CASE DRAIN FILTER IAW MAINTENENCE MANUAL PROCEDURES. GROUND RUN AND LEAK CHECK WERE GOOD.