As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE START VALVE REMAINED OPEN AFTER 55% N2 CLOSED WITH START SWITCH TO OFF. GROUNDED-YES. AS REQUESTED, REF B737-900 WDM 80-11-11 AND B737-900 AMM 80-11-03, VERIFIED 28VDC AT START VALVE NUMEROUS TIMES WITH ENGINE START SW TO GROUND POSITION. NO INTERMITTENT OPERATIONS. REMOVED AND REPLACED NR 2 ENGINE START VALVE, REF B737-900 AMM 80-11-03 AND PERFORMED A GOOD START VALVE TEST. ACCOMPLISHED NR 2 ENGINE START, REF AMM 71-00-00. STARTER SWITCH CUT OUT NORMALLY OCCURRED AT 56% N2.