What was found
UPON LANDING, AIRSPEED INDICATION SHOWS RED X AND ALSO PITOT HEAT MESSAGE IS SHOWN. UNIT OPERATES NORMALLY IN FLIGHT, ONLY OCCURS AFTER LANDING. REPLACED EFD-1000 PRO PFD DISPLAY AS REQUIRED. PERFORMED SYS OPS CHECKS IAW EFD1000 INSTALLATION MANUAL, PN 900-00003-001.0