As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BWI/DCA - FLT 3281 - THE LEFT MAIN GEAR DROPPED SLIGHTLY IN-FLIGHT AND THE GEAR DOOR OPENED. THE AIRCRAFT CONTINUED ON TO DCA AND LANDED WITHOUT INCIDENT. FOUND NR 2 HYDRAULIC SYSTEM CASE DRAIN FILTER CONTAMINATED. REMOVED AND REPLACED NR 3 AND NR 4 HYDRAULIC PUMPS. REFERENCE OPERATOR CONTROL NR 95ZZZX6292.