As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JAN - DCA DIVERTED INTO ROA HYD SYSTEM NR 2 HIGH TEMP CAUTION MSG AND THEN LOST PRESSURE. CAPT SHUT THE ENGINE DOWN, QTY AT 15 PERCENT AFTER LANDING. EN ROUTE TO DCA A/C DIVERTED TO ROA DUE TO MTC. EMERGENCY DECLARED. FLT 4459 CX AND ON 5/12/07 FLT 4623 CX.