As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYDRAULIC SYSTEM 3 LOST ALL FLUID WHEN GEAR EXTENDED. EMERGENCY DECLARED, EMERGENCY TRUCKS FOLLOWED A/C TO THE GATE. REMOVED AND REPLACED 3B HYDRAULIC PUMP PRESSURE LINE IAW CRJ 200 AMM 29-12-18. OPS AND LEAK CK GOOD. LINE P/N AE4096G0060-000.