What was found
DURING DECENT, RECEIVED WSHLD HEAT R FAIL FOLLOWED BY IAS WARNING. CAPTAINS IAS MATCHED STBY AIRSPEED INDICATOR. F\O'S INDICATED AIRSPEED SHOWED 10-15 SLOW. THEN RECEIVED SEL ELEV FEEL MAN AND SEL FLAP LIM OVRD AND AUTO SLAT FAIL. BOTH A\P AND A\T INOP. FLIGHT DIRECTORS INOP. ALSO RECEIVED WINDSHEAR DETECT FAIL. THEN RECEIVED FLAP DISAG AT FLAPS 22. FOUND F\O'S PITOT TUBE DRAIN HOLES PLUGGED. CLEARED OBSTRUCTION IAW MD-11 AMM 34-11-01-2. PERFORMED FCC'S 1 AND 2 RTS AUTO FLIGHT SYSTEM TEST IAW AMM 22-00-00-5. BOTH CHECKED GOOD. WINDSHEILD HEAT PORTION OF THIS DISCREPENCY TRANSFERRED TO WRI 30-40/8526. A\C GOOD FOR SERVICE.