As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ILLUMINATION OF MCP HDG DISPLAY AND F/O COURSE DISPLAY DIM WITH MAIN PANEL RHEOSTAT IN FULL BRIGHT. GROUNDED - YES. REMOVED AND REPLACED MCP IAW B737-900 AMM 22-11-34/401. REF LP # 60466104 FOR LRU REPLACEMENT TEST AND LAND VERIFY TEST.