As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOT ABLE TO SET MCP ALTITUDE. ( TRIED A REET BUT STILL NOT WORKING) STUCK AT 37900FT. GROUNDED - YES. PERFORMED A/C POWER DOWN FOR TROUBLESHOOTING REF B737-800 MM 0-60-99. MCP ATTITUDE WAS ABLE TO RESET, AND NO LONGER STUCK @ 37900 FT. PERFORMED DFCS BITE REF FIM 22-11 TASK 801. TEST PASSED. GROUND VERIFICATION SUCCESSFUL. SEAMC LASTER NOTIFIED.