What was found
DURING CLIMB NR 2 ENGINE BLEED VALVE REG FAULT LIGHT CAME ON. TEMP INCREASE TO 230 DEGREES AND TEMP HI LIGHT CAME ON FOLLOWED BY A/C PACK FAULT LIGHT. UNABLE TO CONTROL PRESSURIZATION DUE TO NR 1 BLEED VALVE CURRENTLY ON MEL (LOCKED OUT) NR 2 HP BLEED FAULT LIGHT CAME ON. AIRCRAFT RETURNED TO AIRPORT. FUEL DUMP PROCEDURES USED FOR LANDING WEIGHT AND AIRCRAFT RETURNED WITH NORMAL LANDING. CLEARED BY ADJUSTING SPECIFIC GRAVITY PER 73-21-02. RUN UP CHECKS COMPLIED WITH, AIRCRAFT RETURNED TO SERVICE.