As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT FLT1780, ON DESCENT INTO PIT FROM BOS, CREW DECLARED AN EMERGENCY WITH AIR TRAFFIC CONTROL DUE TO LOW HYDRAULIC QUANTITY. FLIGHT LANDED WITHOUT INCIDENT AND TAXIED TO THE GATE. MAINTENANCE FOUND THE NR 2 ENGINE DRIVEN HYDRAULIC PUMP LEAKING. REMOVED AND REPLACED HYDRAULIC PUMP. ALSO, FOUND THE BRAKE ACCUMULATOR LEAKING AT END CASE. REMOVED AND REPLACED ACCUMULATOR PER TASK 32-41-51-404-013. REMOVED AND REPLACED ALL HYDRAULIC FILTERS. RAN NR 2 ENGINE. OPERATIONAL CHECK AND LEAK CHECK GOOD.