What was found
DURING PREFLIGHT BRAKE PRESSURE ACCUMULATOR LOSES PRESSURE FROM 3000 PSI TO 2500 PSI IN 1 MINUTE. POSSIBLE PRESSURE LEAK IN ACCUMULATOR. PRESSURIZED TO RESET STAB TRIM & SET PARKING BRAKE. CAPPED RETURN LINES TO PARKING BRAKE VALVE, LEAK DOWN STILL OUT OF LIMITS. CONTINUED TROUBLESHOOTING PER FIM 32-41 FAULT TREE 807 BLOCKS 1,2,4,13,14,AND 15, REPLACED RH BRAKE METERING VALVE ASSEMBLY PER MM32-41-03, PARKING BRAKE SYSTEM TEST PER MM32-44-00 LEAK DOWN TEST IN LIMITS. THIS CLEARS DEFERRAL