As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI LT FWD BOOST PUMP EICAS MESSAGE AND LOW PRESS LIGHT. REMOVED AND REPLACED LT FWD BOOST PUMP PER AMM. NO HELP. FOUND NO VOLTAGE ON PH A OR B OF 115VAC GROUND SERVICE BUSS. CYCLED CB C316 GROUND SERVICE BUSS AND POWER RETURNED TO BOOST PUMP CB C372. SUSPECT K102 STUCK. BOOST PUMP NOW OPERATING NORMAL. MCO/PLACARD REMOVED. ACFT OK FOR SVC.