A B767-200 PARKED ON GATE EXPERIENCED NUMEROUS FAULTS IN THE FLT GUIDANCE SYS DUE TO THE AUTOPLT MCP MALFUNCTION.

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WHILE DOING COCKPIT PREPARATION FOR FLT ZZZ-SFO; HAD 'NO LAND 3' DISPLAYED. COULD NOT RESET; WHICH MEANS SOMETHING AFFECTING LAND 3 OP WAS FAULTY. WHILE WAITING FOR MAINT TO MCO OR DEFER THE SIT; THEY DISCOVERED THE L ILS WAS FAULTY. IN A COUPLE OF MINS; THE FO'S FLT DIRECTOR WAS BIASED OUT OF VIEW. COUPLE OF MINS LATER; AFTER THESE 2 ITEMS HAD BEEN DEFERRED; THE LIGHTS FOR THE R AUTOPLT ON THE MCP WENT OUT AND WOULD NOT TEST. THEY TRIED A NEW FCC ON THE R SIDE; NO HELP. NEXT; THE FO ORANGE SPD BUG DISAPPEARED. THEY FINALLY CHANGED THE MCP; REMOVED ALL THE MCO'S AND WE HAD A NORMAL FLT. THIS MCP WAS DEVOURING ITSELF BEFORE OUR EYES. HAD THE FAILURE SEQUENCE BEEN IN 30 MIN INCREMENTS INSTEAD OF 3 MIN INCREMENTS; WE WOULD HAVE BEEN IN CRUISE WHEN ALL THESE THINGS BEGAN QUITTING; AND NO ONE KNOWS HOW FAR IT WOULD HAVE GONE. THIS COULD PROVE DISASTROUS -- TO HAVE AN MCP EAT ITSELF INFLT. IT IS HOW WE COMMUNICATE WITH THE AUTOPLT; FLT DIRECTOR; ALT SELECTION; AND SPD SELECTION. OF COURSE; IF ALL THAT FAILS; YOU CAN STILL FLY IT LIKE A BASIC AIRPLANE.