As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DECLARED EMERGENCY - AT ALT "B" SYS HYDRAULIC QUANTITY RAPIDLY FELL TO 1/3 FULL. SHORTLY AFTER B SYS ENGINE DRIVEN PUMP LOW PRESSURE LIGHT ILLUMINATED. PUMP SHUT DOWN IAW QRH. FOUND "B" SYS PRESSURE LINE TO LANDING GEAR TRANSFER VALVE LEAKED. REMOVED AND REPLACED O-RING, B SYS. RETURN FILTER, CASE DRAIN FILTER FOR EDP & EDMP PER MM.