As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, APU ON START UP SHOWED APU FAULT AND SHUT DOWN AUTOMATICALLY EICAS MSG APU FAULT. BITE CK ECD "START ABORTED" FAULT. FOUND STARTER BRUSH IND LOW/BATT VOLTAGE LOW W/LOAD. REMOVED AND REPLACED APU BATT PER MM 24-31-04. REMOVED AND REPLACED APU STARTER PER MM49-41-01. OPS CK OK BATT PN BA06-01 SN ON 49975 OFF 118341, STARTER PN 519858-8, SN ON 5480 OFF 5318.