As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 ENG START SW WILL NOT STAY ENGAGED IN GRD POSITION. WHEN HOLDING START SW MANUALLY -NO-US. GROUNDED - YES. PERFORMED OPS CHECK ON NORMAL ENGINE PROCEDURES FOR ENGINE 1 IAW B737-900 AMM 71-00-00-800-808-100. COULD NOT DUPLICATE DISCREPANCY. OPS CHECK GOOD.