As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LNAV/VNAV UNABLE TO BE SELECTED. GROUNDED - YES. CURRENT STATUS TEST SHOWS MCP DATA FAULT. REPLACED MCP REF B737-800 AMM 22-11-34-000-801. OPS TEST NORMAL REF AMM 22-11-34-740-801. LAND VERIFY TEST NORMAL REF AMM 22-11-00/201 BITE TEST GROUP #49.