As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU COLD SOAK FAILED ON FIRST 3 ATTEMPTS AT FL410. POST FLIGHT REPOST AND BIT OF ECU SHOWED FLOW DIVIDER FAULT. MAINTENANCE INSPECTED THE FLOW DIVIDER, FOUND THE LOWER LINE OF FLOW DIVIDER LOOSE AND TIGHTENED THE LINE. OPS CHECK OF APU WITH NO FAULTS NOTED.