As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER STARTING #1 ENGINE, STABILIZED, THEN SHUTDOWN AUTOMATICALLY WITH NO ABNORMAL INDICATIONS. GROUNDED - YES. FOUND FAULT CODE 71-43691 ENGINE STALLED DURING START. PERFORMED B737-9 IFIM TASK G71-00-00-810-869/ENGINE IDLE SYSTEM TEST STEP B(2) PASSED. FAULT DID NOT RETURN AND FAULT WAS CORRECTED NO LEAKS NOTED FROM DRAIN MAST.