As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WILL NOT START 2 ATTEMPTS. HAS HISTORY, NO TIME. APU TESTER SHOWED IGV ACTUATOR TM RESISTANCE OHMS OUT OF TOLERANCE ON STATIC TEST. MAINTENANCE STATUS MSG SHOWED FAULT AT 35 PERCENT RPM. REPLACED IGV ACT, STARTED APU SEVERAL TIMES WITH NO PROBLEMS. TOLERANCE WITHIN LIMITS. NO LEAKS NOTED. PROBLEM RECURRED. RPL'D FUEL CONTROL UNIT IAW AMM, OPS CHECKS GOOD.