As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BEFORE TAKEOFF CHECKLIST NOTED RIGHT BLEED VALVE NOT CLOSED FOUND CB H16 POPPED. CONTACTED MOC. ADVISED TO RESET CB. CB H16 POPPED A SECOND TIME. CREW ELECTED TO RETURN TO THE GATE. REMOVED AND REPLACED PRSO VALVE IAW SAAB340 AMM 36-11-05-02. OPS CK NORMAL, PER SAAB 340 AMM 36-11-00-02. AIRCRAFT RETURNED TO SERVICE.