What was found
F/O NR 1 WINDOW ARCED AND CRACKED IN FLT (ALTITUDE APPROX 31,000). REMOVED AND REPLACED F/O NR 1 WINDOW PER MM, NO LEAKS NOTICED AT THIS TIME. AIRCRAFT OK FOR SERVICE. AIRCRAFT RECERTIFIED TO CAT IIIA STATUS, DO TO REMOVAL AND REPLACEMENT OF MCP TO FACILITATE OTHER MAINTENANCE.