What was found
FLT NR 0299 - EWR - THE 'A' HYD SYSTEM OVERHEAT LIGHT ILLUMINATED IN FLIGHT. THE 'ABNORMAL' PROCEDURES WERE COMPLIED WITH, BUT HAD NO EFFECT. A RETURN TO EWR WAS INITIATED AND ON FINAL APPROACH THE 'A' SYSTEM PRESSURE WENT TO 500 PSI ACCOMPANIED BY ILLUMINATION OF BOTH HYDRAULIC 'A' SYSTEM LOW PRESSURE LIGHTS. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE 'A' SYSTEM HYDRAULIC MODULE LEAKING. THE MODULE WAS REMOVED AND REPLACED AND LEAK CHECK WAS GOOD. (M)