As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST PRIOR TO PUSHBACK APU "MAINT" LIGHT ILLUMINATED. AFTER APU SHUTDOWN "FAULT" LIGHT ILLUMINATED ALSO. CDU FAULT HISTORY SHOWS CODES 49 41244 "GEN DIODE FAIL" AND 49 11019 DC POWER LOSS SHUT DOWN. PERFORMED FIM TASK 49 40 TASK 806. REPLACEMENT OF STARTER GENERATOR REQUIRED. REPLACED APU STARTER GENERATOR. REF MM TASK 49 41 21 400 801. OPS CHECKED AND LEAKS CHECKED GOOD.