What was found
MCP WENT BLANK EXCEPT FOR IAS, HDG AND ALT. WHEN GS WAS SELECTED FLIGHT DIRECTORS SUDDENLY COMMANDED A CLIMBING LEFT TURN, WHICH WAS TOTALLY INCONSISTENT. WE TURNED OFF FD AND RIGHT AUTOPILOT IN UNSUCCESSFUL ATTEMPT TO RESET SYSTEM. PERFORMED T/S PER FIM 22-02 / 801. FCC TESTS NO FAULTS BPCU TESTED IAW AMM 24-41-03-4. NO FAULTS INDICATED. PSEU BITE LDG GEAR SYSTEM 1 & 2 IAW AMM 32-61-00. LANDING GEAR LIGHTS CHECKED OK. R&R FCC- R IAW AMM 22-11-01-4. R&R BPCU IAW AMM 24-41-03-4. TESTED OK.