As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT CODE 49-72104 DMM SHOWS CIRCUIT FAILURE LOGGED IN FMC/CDU. ACFT GROUNDED. APU FAULT CODE 49-72104 SHOWS UNDER MAINT HISTORY ON ALMOST EVERY OF LAST 33 STARTS. R & R APU DATA MEMORY MODULE REF MM 49-72-11. OPS NORMAL REF SAME. PERFORMED 3 EA SPU STARTS, SHUTDOWNS W/ NO RECURRENCE OF FAULT UNDER CURRENT STATUS OR MAINTENANCE.