As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED START AT FL380. APU FAULT LIGHT ILLUMINATED, THEN EXTINGUISHED AFTER FIVE MINUTES. SUCCESSFUL APU START AT FL 320 45 MINUTES AFTER FIRST ATTEMPT. GROUNDED - YES. PER CARL SEAMC, COLD SOAK START SUCCESSFUL. THIS CLEARS MEL49-99E.