As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL OF THE GREEN BACKLIGHTS ON THE BUTTONS ON THE MCP PANEL SEEM TO BE STUCK IN DIM MODE. ANY BUTTONS SELECTED, AS WELL AS A/T ARM LIGHT, ARE DIFFICULT TO SEE IN BRIGHT COCKPIT. GROUNDED - YES. VERIFIED FAULT, CYCLED PWR TO A/C NO HELP. REPLACED MCP WITH SERVICEABLE ONE. ACCOMP MCP INST TEST AND LAND VERIFY TEST ALL TESTS PASS. REF B737-800 AMM 22-11-34-400-801/22-11-00-700-807.