As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAS KNOB ON MCP CYCLES UP AND DOWN A/S WHEN TURNING IN SINGLE DIRECTION. GROUNDED - YES. OPERATED SPEED KNOB THROUGHOUT RANGE, AND AT MULTIPLE DIFFERENT SPEEDS OBSERVING CORRECT OPERATION. NO SKIPS, AND CORRECT "COUNT" PER CLICK. ACCOMPLISHED 70.54 EXTENDED MAINTENANCE TEST. ALL TESTS PASS. REF B737-800 AMM 22-11-00. ETOPS GROUND VERIFICATION SUCCESSFUL.