As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WILL NOT CRANK ON START - APU. STARTED APU, OPS OK. MCDU REPORTS, APU FAULT CONDITION: IGNITION UNIT (8030KM) AND FUEL CONTROL UNIT.(8022KM) NO PARTS SFO. APU SYSTEM SELF TEST FAULTS SPEED SNSR1 (8060KM1) NOT IN STOCK. SPEED SENSOR ATA: 49-71-13 AND IGNITION UNIT ATA 49-13-38. EXCITER ORDERED TO SFO OTSF:B0183. REPLACED BOTH IGNITER AND 2ND START OK. SPEED SENSOR REQUESTED TO ORDERED.