As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. LANDING UNEVENTFUL. ACFT NOT OVERWEIGHT. DURING CRUISE THE FLIGHT, CONTROL B LOW PRESSURE LIGHT ILLUMINATED. ACCOMPLISHED QRH CHECK LIST. SYSTEM A, HYDRAULIC PRESSURE AND QUANTITY SHOWING NORMAL. MAINTENANCE ACCOMPLISHED FIM TASK 27-21-00-810-814 WITH NO FAULTS NOTED.