As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LIGHT BULB BURNT OUT IN VNAV ON MCP. GROUNDED - YES. REMOVED AND REPLACED MODE CONTROL PANEL IAW B737-800 AMM 22-11-34-000-801 AND 22-11-34-400-801, OPS CHECK GOOD. LRU REPLACEMENT TEST FOR MCP BITE TEST GROUP #32 GOOD IAW AMM 22-11-34/501 AND LAND VERIFY TEST BITE TEST GROUP #49 GOOD IAW AMM 22-11-00/201.