As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WILL NOT START. STARTER APPEARS TO WORK BUT NO EGT OR RPM RISE. FOUND APU START/GEN GROUND CABLE MELTED DUE TO ARCING BETWEEN GENERATOR TERMINALS. ALSO FOUND TERMINAL ON START/GEN TO BE MELTED. REMOVED START/GEN AND GROUND CABLE AND REPLACED WITH SERVICEABLE UNITS. REMOVED AND REPLACED APU GCU WITH A SERVICEABLE UNIT. OPS CHECK GOOD.