What was found
(CAN) THIS PUMP TURNS ON FROM ENGINE START UNTIL SHUT DOWN. AT THE END OF GING TO LEG, PILOT NOTICED FUEL PRESSURE HITTING VARY MIN (25 PSI)A T IDLE 750 RPM, UNBURN RUNNING OK AT 1000 RPM. (CARGO FLIGHT ON RETURN LAG, TAKEOFF AND CLIMB OK. DURING CRUISE, RIGHT FUEL BOOST PUMP INOP LIGHT CAME ON FOR THE REST OF THE FLIGHT. PILOT PULLED CIRCUIT BREAKER OFF. AFTER LANDING, PUMP CHECKED AS DEAD, INOP, WITH EFFORT TO START WHEN TAPPED ON. REPLACED PUMP. NOTE: CHECKED ALL AIRCRAFT ASM, SBS, SLS/INSP PROG, NO TBO PRESCRIBED. (X)