What was found
NORMAL TAKEOFF, AT 500FT LOST BOTH FLIGHT DIRECTORS, ATC GAVE CLIMB 28K ALTITUDE, WINDOW WENT TO 50K & ENTIRE MODE CONTROL PANEL FROZEN. HAD A LOUD ALTITUDE DEVIATION HORN GOING OFF COULDN`T SILENCE. CAPT HDG SELECTOR ON MFD WAS ABOUT 180 DEG DIFFERENT THAN 1ST OFF. PERFORMED MODE CONTROL PANEL TESTS IAW FIM 22-11, TASK 803. FOUND PIN FAULT J1A-F01 FCC B. MCP INTERACTIVE TEST FOUND PIN FAULT J1A-K06 & J1A-J06 FCC B. REPLACED MCP IAW AMM 22-11-34, NO HELP, SLAVED IN NEW FCC A & B IAW AMM 22-11-33, NO HELP, SUSPECT MCP BAD FROM STOCK DUE TO ADDITIONAL FAULT MESSAGES. INSTALLED ORIGINAL MCP, INSTALLED KNOWN GOOD PART IN FCC B LRU, TEST PASSED.