As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POWER BRAKE SYSTEM FAILURE (POWER BRAKE LOW PRESS AND ANTI-SKID INOP LIGHT ON) LIGHT STAYS ON. [07-10-07] FOUND THE BRAKE PRESSURE RELIEF VALVE STUCK IN THE OPEN POSITION. REMOVED AND REPLACED THE RELIEF/BLEED VALVE IAW CESSNA CITATION 560 ULTRA 20-10-06. OPERATIONAL CHECK WAS SATISFACTORY & NO LEAKS NOTED AT THIS TIME