As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NUMBER 5028, DURING TAXI WITH HYDRAULIC SYSTEM-B OFF, BRAKE PRESSURE DROPS RAPIDLY WHEN BRAKES APPLIED. MAINTENANCE REMOVED AND REPLACED NORMAL RELAY NR 1 3343-K3 PER FIM 32-48-00, FIG 103, BLOCK 12 AND MM 32-40-02. PRESSURE DECAY WITHIN LIMITS PER MM 32-48-00, FIG 4.