As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO SELECT LNAV/VNAV IN THE MCP. GROUNDED - YES. PERFORMED A/C POWER DOWN FOR TROUBLESHOOTING REF B737-800 AMM 20-60-99.PERFORMED B737-800 FIM 22-11 TASK 801 DFCS BITE, AUTO TEST PASSED, NO CURRENT FAULTS. GROUND VERIFICATION SUCCESSFUL.