As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRSPEED WINDOW STUCK AT 100 AND ALTITUDE PRESELECT WINDOW WILL NOT REMAIN AT SELECTED ALTITUDE KEEPS JUMPING TO 50000. GROUNDED - YES. ACCOMPLISHED DIGITAL FLIGHT CONTROL SYSTEM OPERATIONAL TEST IN REF TO B737-900 AMM 22-11-00-740-801. OPS CHECKS NORMAL ACCOMPLISHED B737-900 FIM 22-11TASK 801 DFCS BITE TEST OPS CHECKS NORMAL. NO DEFECTS NOTED.