As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MODE CONTROL PANEL LOCKUP AT TOP OF DESCENT-ALTITUDE ALERTING TONE / COND NOT SILENCE-MCP ALTITUDE WINDOW INDICATED 50,000 DID NOT PULL AFCS MCP DC 1 / DC 2 CB'S PANEL UNLOCKED UPON LANDING. GROUNDED - YES. PERFORMED MODE CONTROL PANEL TEST IAW B737-800 FIM 22-11 TASK 803 AUTO TEST AND INTERACTIVE TEST PASSED. NO FAULTS NOTED. PERFORMED DFOS BITE IAW 22-11 TASK 801 FIM, NO EXISTING FAULTS.