As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED TO START NO APU FAULT EICAS (<P>TRANSFERRED TO MDDR 105126 AS PER MEL 49-11-01A CAT C.</P><P>PERFORMED APU WIRE BUNDLE ALL WIRING CHECK FOUND OK. FOUND MONOPOLE SENSOR SHORTED. REMOVED AND REPLACED SENSOR TS9 IAW AMM 49-51-02</P>)