What was found
SJO - FLT 641 - DURING CLIMB, 30 MINUTES AFTER TAKEOFF, GREEN ENGINE NR 1 PUMP FAULT AND OVERWEIGHT LANDING PROCEDURE ACCOMPLISHED AS PER QRH 221. THE AIRCRAFT RETURN TO SJO STATION AND LANDING WAS SUCCESSFULLY. AIRCRAFT IS ON GROUND SUBJECT TO INVESTIGATION BY MAINTENANCE DEPARTMENT. (M)