As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT ON FIRST START ATTEMPT ECS FAULT MSG WAS "A-C START CIRCUIT". REPLACED APU CRANK CONTACTOR. REPLACED APU STARTER MOTOR. ERASED ALL FAULT MSGS ON ECS BOX AND FAULT MSG ON EICAS APU PAGE. APU STARTED SUCCESSFULLY ON 1ST AND 2ND TRIES AT GATE IN SFO.