As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DECLARED EMERGENCY, HYD SYTEM NR3 DOWN TO 10 PERCENT QTY LOW, MANUAL GEAR DROP BY CREW. CREW REPORTED AT 2500 PSI THEY WERE LOSING 100 PSI EVERY 3 MINS, CREW REPORTED AT 1637Z THEY RECEIVED A HYD LOW PRESSURE LIGHT WAS ON. FOUND BALANCE RELIEF VALVE LEAKING. R & R BALANCE RELIEF VALVE. OPS CHECKS GOOD IAW CRJ900 29-12-05 SEE NON ROUTINE WORK CARD 349989 FOR DETAILS. PN ON/OFF 975275-3 SN OFF PN2302 SN ON PN0253.