As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOI - ON FLIGHT 4276, RETURNED TO GATE, RIGHT ENGINE BLEED MASTER CAUTION MESSAGE APPEARED DURING TAXI OUT IT WENT OFF WHEN PULLING IN TO GATE. MAINTENANCE INSPECTED DUCT, VERIFIED MDC NO CURRENT MESSAGE OR HISTORY FAULTS. GROUND RUN, NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.