As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
START VALVE OPEN ANNUNCIATOR REMAINED ILLUMINATED AFTER ENGINE #2 START. RAN QRH AND ANNUNCIATOR STILL ILLUMINATED. GROUNDED - YES. PERFORMED GOOD CHECKS ON VALVE AND WIRING FROM DEU1 AND DEU2 TO START VALVE PER B737-900 FIM 80-07 TASK 809. PERFORMED GOOD LLM AND OPS TESTS OF DEU1 AND DEU2 PER B737-900 AMM 31-62-21-400-801. REMOVED/REPLACED #2 ENGINE START VALVE - REF AMM 80-11-03. NO DEFECTS NOTED DURING PNEUMATIC LEAK CHECKS.