As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU CONTROL STATUS MESSAGE ILLUMINATED. TROUBLESHOT APU CONTROL FAULT. SYSTEM SHOWED LATCHED FAULT AND ACTIVE WITH "ELECTRIC STARTER MOTOR BRUSH WEAR". REPLACED ELECTRIC STARTER PER MM, OPS GOOD. STARTED APU 3 TIMES WITH NO FAULTS AND MESSAGE NOT ACTIVE.