What was found
FLIGHT 5158 - EN ROUTE IAD-CVG RECEIVED A NR 1 HYDRAULIC LOW PRESSURE CAUTION MESSAGE, FLIGHT RETURNED TO THE FIELD. REPLACED THE NR 1 ENGINE DRIVEN HYDRAULIC PUMP.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
FLIGHT 5158 - EN ROUTE IAD-CVG RECEIVED A NR 1 HYDRAULIC LOW PRESSURE CAUTION MESSAGE, FLIGHT RETURNED TO THE FIELD. REPLACED THE NR 1 ENGINE DRIVEN HYDRAULIC PUMP.