What was found
PDX - ON FLIGHT 2139 CAPTAIN'S ADI FAILED, AHRS INVALID MESSAGE, WEATHER RADAR INOP, AND COMM RADIOS P-STATIC. AIRCRAFT RETURNED TO THE FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. MAINTENANCE PERFORMED OPERATIONAL AND FUNCTIONAL CHECKS OF THE COMM SYSTEM, THE AHRS SYSTEM, AND THE WEATHER RADAR SYSTEMS. ALL CHECKS GOOD. ALSO A LIGHTNING STRIKE INSPECTION WAS PERFORMED WITH NO DEFECTS NOTED AND NO EVIDENCE OF LIGHTNING STRIKE. NO PARTS REPLACED AND AIRCRAFT RETURNED TO SERVICE.