As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTS APU FAILED TO START, MULTIPLE ATTEMPTS ON GROUND. GROUNDED - YES. PERFORMED APU BITE TEST FOUND MAINTENANCE MESSAGE "NO APU ROTATION SHUTDOWN" OCCURRED SEVERAL TIMES IN LAST 65 STARTS. NO OTHER FAULTS FOUND. SUSPECT STARTER TO BE INTERMITTENT. REMOVED AND REPLACED STARTER GENERATOR REF TO B737-800 AMM 49-41-21, OPS CHECKED AND LEAK CHECKED C/W.