As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU START SYSTEM APUC DETECTED FAILURE IN THE ELECTRIC STARTER, FUEL SCHEDULING, IGNITION, OR LUBE DEPRIME SYSTEMS OR NO SIGNAL FROM ELMS TO THE APUC. 10-16-07 REPLACED APU IGNITOR PLUG NR 1 PER MM49-41-02, AND IGNITION LEAD NR 1 PER MM49-41-04. APU BITE TEST ACCOMPLISHED. CHECKD OK.