As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EAPU FAULT LIGHT ILLUMINATED. TURNED OFF 3 TIMES DURING PREFLT WITH APU IN OFF POSITION PERFORMED FIM 49-60-00-810. FOUND FAULT CODE 4961156 IN FAULT HISTORY. REMOVED AND REPLACED APU ECU. OPS TEST AND BITE TEST GOOD REF FIM 49-60-00-810.