As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE APU FAILED TO START ON TAXI IN . FAULT LIGHT ILLUMINATED. GROUNDED - YES. REMOVED & REPLACED DATA MEMORY MODULE REF B737-800 AMM 49-72-11-000/400-801. FAULT MESSAGE : 49-72101 AND 49-72105 CLEARED. OPS TEST GOOD. APU OPERATES NORMALLY. A/C OK FOR SERVICE