As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 ENG WITH GOOD AIR PSI START VALVE OPEN INDICATION BUT NO ROTATION. TRIED 3 ATTEMPTS. FIRST ATTEMPT SHOWED A SLIGHT ROTATION THEN ZERO. THE OTHER 2 ATTEMPTS SHOWED ZERO OR NO ROTATION. GROUNDED - YES. REMOVED #1 ENG STARTER REF B737-800 AMM 80-11-01-000-801-F00. INSTALLED NEW STARTER REF AMM 80-11-01-400-801-F00, OPS AND LEAK CHECKS GOOD.