As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAILED TO START ON FIRST ATTEMPT. GROUNDED - YES. CHECKED AND RELEASED PER MEL 4-1B. APU INOP FAILED TO START ON FIRST ATTEMPT. SHOWED TWO MAINT MSG 49-41254 AND 49-61145. COMPLIED WITH MAINT PROCEDURES. APU OPERATIONAL TEST REF B737-900 AMM 49-11-00, OPS CHECKS NORMAL. NO CURRENT FAULTS NOTED. CLEARS MEL 49-1B.