As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAULT LIGHT ILLUMINATED DURING APU START ATTEMPT AT FL410. SUCCESSFUL CSS ACCOMPLISHED AT FL330 AFTER FAULT LIGHT EXTINGUISHED. APU STARTED OK ON GROUND ALSO. GROUNDED-YES. ACCOMPLISHED APU BITE, IAW B737-800 FIM 49 33 TASK 803 FAULT CODES 49-31295 AND 49-31016 AND FLIGHT LEGS THREE. NO CURRENT FAULTS NOTED. ACCOMPLISHED OPERATIONS CHECK AT APU, IAW B737-800 AMM 49-11-00. OPERATIONS CHECK OK.