As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VNAV SWITCH LIGHT OUT WHEN SELECTED AND ON LIGHTS TEST. VNAV WORKS NORMAL. REPLACED MCP PANEL REF MM 22 11 34. ACCOMPLISHED LWMP TEST BITE NR 32 AND BITE NR 49 AND HGS SENSOR TEST FCC/AT REF LWMP CHECKLIST MM 22 00 01 AND SMM 34 36 00. ALL TEST GOOD.