As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT BLEED EICAS ALONG WITH NO RT BLEED DUCT PRESSURE. EVEN THROTTLE BUMP STILL NO DUCT PRESSURE. RETURN TO GATE. HP SHUTOFF VALVE FAILED CLOSED. FOUND HPSOV SENSE LINE AT CONTROLLER VERY LOOSE. TIGHTENED. REPLACED HPSOV AND HPSOV CONTROLLER, PRECAUTIONARY, IAW MM 36-11-07 AND MM 36-11-08. RAN ENGINE, BLEED VALVE OPS OK AND PNEU INDICATIONS NORMAL.