As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCP ALTITUDE WINDOW LOCKED UP AT 25,000 SELECTED VALUE ON CLIMB OUT OF 10,000 WE TRIED FOR APPROX 8 MIN TO RESET MCP VALUE WITH BOTH A/P'S AND F/D'S OFF. AFTER SELECTING ALT INTV ON MCP WE WERE ABLE TO RESET MCP ALTITUDE TO 35,000 AND WE LATER CONFIRMED SELECTED MCP VALUES WERE ALSO INDICATED ON BOTH PFD DISPLAYS. ACFT GROUNDED. REPLACED MCP IAW AMM 22-11-34. INSTALLATION TEST PASSED. ACFT OK FOR SERVICE.