As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING START OF #1 ENG THE N2 GOT TO 24% THEN WENT BACK DOWN TO 7% START VALVE LIGHT WAS ON. WE TRIED A CROSSBLEED START, N2 ONLY GOT TO 7%. START VALVE WAS ON. GROUNDED - YES. FOUND DAMAGE ON STARTER BLADES, REMOVED AND REPLACED ENG #1 STARTER IAW B737-900 AMM 80-11-01. OPS TEST NORMAL, IDLE CHECK AND LEAK CHECK GOOD.