What was found
UNRELIABLE AIRSPEED. IAS MSG DISPLAYED ON BOTH PFD'S. FO AND STANBY INSTRUMENTS WERE SHOWING CONSISTENT AIRSPEED. EMERGENCY DECLARED. DIVERTED TO OKC. NOT OVERWEIGHT LDG. C/A-REMOVED WATER FROM CA AND FO PITOT DRAIN LINES IAW AMM 34-13-00. PERFORMED OPC AND FUNC OF FO ADC IAW AMM 34-15-00. OPC AND FUNC GOOD. FO PITOT STATIC SYS LEAK CHECK GOOD IAW AMM 34-13-00. PERFORMED OPC AND FNC OF ISIS. OPC AND FNC GOOD IAW AMM 34-01-01. LEAK CHECK GOOD IAW AMM 34-13-00. REMOVED AND REPLACED CA ADC IAW AMM 34-15-01. OPC GOOD. SEE ITEM 1 AML PG 4466921 FOR LEAK CHECK.