As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON 1ST ATTEMPT TO START THE #2 ENGINE, NO ROTATION OF N2, ON 2ND ATTEMPT TO START WE GOT VERY SLOW N2 ROTATION. TURNED THE STARTER SWITCH OFF. ON 3RD ATTEMPT THE START WAS NORMAL. GROUNDED - YES. REMOVED AND REPLACED #2 ENGINE STARTER VALVE PER B737-800 AMM 80-11-03. OPS CK GOOD.