As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPT MCP COURSE SELECTOR STUCK ON 020* - WILL NOT MOVE AFTER SELECTING APU POWER, SELECTOR APPEARS NORMAL. GROUNDED - YES. ACCOMP LRU REPLACEMENT TEST FOR MCP. TEST PASS ALSO ACCOMP LAND VERIFY TEST BOTH PASS NO FAULTS. REF B737-800 AMM 22-11-34-839-001 & 22-11-00-700-801.