As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYD SYSTEM 2 LOW PRESSURE CAUTION MSG. IN FLIGHT. EMER DECLARED. / UPON ARRIVAL TO AIRCRAFT CLEANED AFFECTED AREA AND FOUND LEAK COMING FROM THE SYSTEM #2 PRESSURE TRANSDUCER. FOUND THE PRESSURE TRANSDUCER TO BE LOOSE AND HAD A CRUSHED O-RING. REPLACED O-RING AND RETORQUED THE #2 PRESSURE TRANSDUCER IAW CRJ700 AMM 29-31-01-000/400-801. LEAK CHECK AND OPS CHECKS GOOD AT THIS TIME.