As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF DEFECT # TSR703265 DURING INSTALLATION TEST OF APU P/N 3800702-1 S/N P-8133APU CURRENT STATUS SHOWS MAINT MSG 49-72104 "DATA MEMORY MODULE SHOWS CIRCUIT FAILURE". GROUNDED - YES. REMOVED AND REPLACED THE APU ECU, OPS CHECK GOOD AND NO FAULTS ON APU BITE CURRENT STATUS. REF FIM 49-70 TASK 807 AND AMM 49-61-12/401.