What was found
(CAN) THE ACFT ENCOUNTERED A YELLOW HYDRAULIC SYS PRESSURE MESSAGE DURING CRUISE AFTER DEPARTURE. AS A PRECAUTION, THE FLIGHT CREW DECLARED A PAN PAN FOR PRIORITY WITH ATC. ONCE STABILIZED, THE FLIGHT CREW IN CONJUNCTION WITH MAINTENENCE AND FLIGHT DISPATCH, ELECTED TO CONTINUE TO DESTINATION. AS A PRECAUTION, THE FLIGHT WILL DECLARE AN EMERGENCY WITH THE AIRPORT AND HAVE CFR ON STANDBY. THERE WAS NO ADVERSE PASSENGER REACTION. B-NUT ON PARK BRAKE ACCUMULATOR FOUND LOOSE AND LEAKING FLUID. B-NUT TORQUED TO STANDARD. YELLOW HYD SYSTEM SERVICED IAW 12-1229-611-001A AND YELLOW HYD. SYSTEM BLED IAW 29-00-00-870-007A. GROUND RUN OF RT ENG C/O TO TEST YELLOW HYD. PUMP AND SYS BLEEDING, NO FAULTS FOUND.