As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU BLEED AIR APUC DETECTED LOSS OF ABILITY TO PNEUMATICALLY LOAD APU. MESSAGE IS TRIGGERED BY IGV OR SURGE CONTROL SYSTEM FAULTS. STATUS MSG01- NOT ACTIVE ENGINE START MODE DEPENDENT; SURGE CONTROL VALVE (PNEUMATIC CLUSTER) DOES NOT FOLLOW COMMAND. DB- APU CONTROLLER (APUC) MSG-4911180 INACTIVE MODE. REPLACED APU CONTROLLER.