As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SPEED TRIM FAIL LIGHT ON AFTER SHUTDOWN. GROUNDED - YES. DFCS BITE SHOWS NO SPEED TRIM FAULTS ON PREVIOUS FLT LEGS CH A OR CH B. FAULT LIGHT ON GROUND ONLY. PERFORMED DFCS TEST 60.32 "SPEED/STAB TRIM" REF B737-9 IFIM 22-11-00-810-D73 TEST PASS. NO FAULTS.