As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SERVICE CHECK, FOUND MCP VERTICAL SPEED LCD WINDOW HAS A WHITE ARC DISPLAY. ACFT GROUNDED. R & R DFCS MCP REF AMM TASK 22-11-34/401. ACCOMPLISHED DFCS LRU INTERFACE MCP TEST GP32 REF AMM TASK 22-11-34/501 AND LAND VERIFY TEST GP49 REF AMM TASK 22-11-00/201. OPS CK NORMAL. ALSO ACCOMPLISHED HGS TESTS REF SMM 34-36-00, OPS CK NORMAL.