As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU HAS HISTORY OF NO BLEED. GROUNDED - YES. REMOVED APU ENGINE WIRE HARNESS AND INSTALLED A SERVICEABLE UNIT. REF B737-900 AMM 49-11-01-00-802. PULLED / RESET TWO C/B'S AS REQUIRED. USED APU BLEED SOURCE TO START ENGINES WITH NO DEFECTS. PERFORMED APU BITE AND NO CURRENT FAULTS. APU BITE REF AMM 49-61-00.