As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT NR 0284 - ON TAKEOFF, THE MASTER CAUTION LIGHT ILLUMINATED. THE HYDRAULIC SYSTEM 'A' PRESSURE WAS FLUCTUATING ABOVE ZERO, AND THE HYDRAULIC SYSTEM 'A' QUANTITY REACHED ZERO. FLIGHT RETURNED TO BOS. MAINTENANCE REPLACED THE NR 6 SPOILER ACTUATOR DUE TO LEAKAGE. OPERATIONS CHECKED GOOD. (M)