What was found
DURING CLIMBOUT, RECEIVED IAS, ALT, WINDSHEAR DET, & SEL ELEV FEEL MAN. DURING RETURN TO LAND ALL FLIGHT INSTRUMENTS RETURNED TO NORMAL. AFTER ACFT RETURNED TO GATE, NOTICED SEVERAL RIBBONS OF ICE, AT LEAST AN INCH THICK ON RADOME, ABOVE AND IN FRONT OF PITOT PROBES. SUSPECT POSSIBLE AIRFLOW ISSUES DUE TO ICE BUILDUP. PERFORMED LOW RANGE LEAK AND OPS CK OF CAPT'S, F/O'S, AND STANDBY PITOT STATIC SYS IAW MM34-16-00-5. NO LEAKS OR DEFECTS NOTED. CONFIRMED PITOT PROBE HEATER OPERATION. ACFT IS OK FOR SERVICE.