What was found
(CAN) AFTER DEPARTURE, THE FLIGHT CREW ENCOUNTERED FAILURES OF BOTH FLIGHT DIRECTORS AND THE AUTOPILOT SYSTEM. THE FLIGHT CREW DIVERTED BACK AND LANDED APPROXIMATELY 3000 KGS OVER THE MAXIMUM STRUCTURAL LANDING WEIGHT. THERE WAS NO EMERGENCY DECLARED AND THERE WAS NO ADVERSE PASSENGER REACTION. MCDP LAST FLT FAULTS: NO INFC FCC L AND C WITH MCP BUS IN. NO A/L MCP/FCC L, MCP/FCC C, MCP/TMC, LT NAV FAIL MCP/FMC LT. MCP PANEL REPLACED AND TESTED SATIS IAW AMM 22-11-02 PB201.