What was found
WHILE AT FL40 NOTED YELLOW IAS LIGHT ON BOTH PFD'S. DURING DESCENT NOTED A 60 KT SPLIT (BETWEEN PILOT AND COPILOT PFD). SWITCHED TO ADC2 AND A/S WERE NORMAL. PITCH TRIM ALSO WOULD NOT RESET, FLEW AIRCRAFT IN SBY TRIM. TECHNICIANS AT NASHVILLE, TN, KBNA WERE DISPATCHED TO AIRPORT CODE KJWN, DRAINED WATER FROM LEFT SIDE PITOT/STATIC DRAINS, RESTORED SYSTEM TO NORMAL CONFIGURATION AND ACCOMPLISHED SYSTEM CHECKS, WITH NO DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.