As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER APU STARTED ON PREFLIGHT, LEVEL 1 ALERT APU STARTER FAULT. APU INOPERATIVE EXTERNAL POWER REQUIRED FOR ENGINE START. STARTER RELAY WILL NOT DE-ENERGIZE. INSPECTED APU COMPARTMENT NO DAMAGE NOTED OTHER THAN STARTER & LEAD. R & R APU STARTER RELAY IAW WDM 49-44-01, REPLACED APU STARTER IAW 49-44-01-2, REPAIRED STARTER LEAD & REINSTALLED IAW WDM 49-44-01 & SWPM. APU OPS CHECKED GOOD.