As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXIING OUT, FLIGHT CREW NOTED UPPER AUXILIARY BOOST PUMP FAILED. FLIGHT CREW ELECTED TO RETURN TO GATE. AIRCRAFT RETURNED TO GATE WITHOUT INCIDENT. MAINTENANCE PERSONNEL REPLACED RIGHT UPPER AUXILIARY BOOST PUMP. RESET RCCB. OPS CHECKED NORMAL. AIRCRAFT RETURNED TO SERVICE. (M)