What was found
(CAN) ON CLIMB THROUGH 19,000 FT THE RT BLEED TRIP LIGHT ILLUMINATED. THE BLEED TRIP RESET PROCEDURE WAS UNSUCCESSFUL AND THE CREW PERFORMED AN AIR TURN BACK WHERE PARTS AND MANPOWER WERE AVAILABLE. MAINTENANCE PERFORMED A BLEED AIR HEALTH CHECK AND REPLACED BOTH THE PRE COOLER CONTROL VALVE AND 390 SENSOR, PN 129666-2, SN 13245, CYCLES 7818.