As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMED HIGH ACT APU START FOR TOMC. NEEDED 3 ATTEMPTS TO GET APU RUNNING. WHEN ON GND APU STARTED BUT NO APU GEN FAULT CODE, APU ECU M1709 BAD, PN 29-4961-9-0002. R & R APU ECU IAW AMM 49-61-12, ALL OPERATIONS CHECKED GOOD AT THIS TIME. RAN APU 3 TIMES WITH FULL LOADS OK TO CONTINUE. ROTABLE PARTS CHANGE WAS INDICATED TT 1705900 SN OFF 00310 UNIT, ELECTRONIC OFF 29-4961-9-0002 0310 ON 29-4961-9-0002 0068.