As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU START SYS STATUS MSG. MX MSG 49-10690 IGNITION CLUSTER HIGH VOLTAGE CIRCUIT IS OPEN. DF PER MEL. INF- :REF: FIM 49-40 & PERFORM TASK 805. RPL NR 2 IGNITOR PLUG REF AMM, ALSO REPLACED IGNITION UNIT AS PRECAUTIONARY & NR 1 IGNITION LEAD, STARTED APU 3 TIMES. NO MESSAGES PRESENT. START NORMAL.