As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING AN APU START AT FL 340 FOR A CSS ON RELEASE THE APU FAULT LIGHT ILLUMINATED WITH AUTOMATIC SHUTDOWN AFTER RUNNING THE QRH PROCEDURE THE FAULT LIGHT EXTINGUISHED APPROXIMATELY 4 MINUTES LATER SECOND ATTEMPT 10 MIN LATER ALSO PRODUCED FAULT LIGHT APU STARTED NORMALLY ON 3RD ATTEMPT AT FL 300. ACFT GROUNDED. REPLACED THE APU ASSY REF AMM 49-11-00 AND TC 78349010. OPS CHECK AND LEAK CHECK GOOD.